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Darwinism[X]
Evolution (1743)
Natural selection (1381)
Evolution (Biology) (1232)
Heredity (611)
Darwin, Charles, -- 1809-1882 (556)
Human beings -- Origin (454)
Geology (417)
Genetics (314)
South America -- Description and travel (269)
Beagle Expedition -- (1831-1836) (255)
Beagle Expedition (1831-1836) (227)
Science -- Philosophy (176)
Psychology, Comparative (173)
Science -- History (163)
Instinct (147)
Evolution -- History -- 20th century (142)
Emotions (123)
Naturalists -- England -- Biography (117)
Darwin, Charles, 1809-1882 Biography (107)
Botany (104)
Eugenics (95)
Plants -- Variation (91)
Heredity, Human (88)
Darwin, Charles, -- 1809-1882. -- On the origin of species (87)
Human beings (86)
Paleontology (83)
Biology -- History (82)
South America (82)
Animal behavior (81)
Biology -- Philosophy (81)
Mendel, Gregor, -- 1822-1884 (81)
Franklin, Benjamin, -- 1706-1790 (80)
Zoology (78)
Darwin, Charles, 1809-1882 (74)
Plants -- Irritability and movements (74)
Fertilization of plants (73)
Humus (73)
Geology -- South America (72)
Genetics -- History (68)
Religion and science -- History -- 20th century (67)
Anthropology (63)
Coral reefs and islands (59)
Human evolution (58)
Voyages around the world (54)
Science and civilization (53)
Soils (53)
Darwin, Charles, -- 1809-1882 -- Biography (52)
Plants, Cultivated (51)
Life (Biology) (50)
Religion and science -- History -- 19th century (48)
Psychology (47)
Carnivorous plants (46)
Lamarck, Jean Baptiste Pierre Antoine de Monet de, -- 1744-1829 (46)
Domestic animals (45)
Life -- Origin -- Philosophy (45)
Earthworms (44)
Creation (41)
Darwin, Charles, 1809-1882. On the origin of species (39)
Huxley, Thomas Henry, -- 1825-1895 (39)
Wallace, Alfred Russel, -- 1823-1913 (39)
Animal psychology (38)
Medicine -- History (38)
Animal intelligence (37)
Philosophy (37)
Heterostylism (36)
Population genetics (35)
Volcanoes (35)
Biogeography (34)
Climbing plants (34)
Franklin, Benjamin, -- 1706-1790 -- Science (34)
Mendel's law (34)
Naturalists -- Great Britain -- Biography (34)
Plants (34)
Bible and science (33)
Cosmology (33)
Festschriften (32)
Embryology (31)
Lumbricidae (31)
Race (31)
Spencer, Herbert, -- 1820-1903 (31)
Anatomy, Comparative (30)
Population (30)
American Philosophical Society (29)
Animals (29)
Genetics Congresses (29)
Cells (27)
Science -- Methodology (27)
Darwin, Charles, -- 1809-1882. -- Correspondence (26)
Darwin, Charles, 1809-1882. Descent of man (26)
Geology -- History (26)
Natural history -- South America (26)
Lyell, Charles, -- Sir, -- 1797-1875 (25)
Apes (24)
Darwin, Charles, 1809-1882. Correspondence (24)
Hybridization (24)
Adaptation (Biology) (23)
Anthropology -- History (23)
Civilization -- History (23)
Ethnology (23)
Evolution (Biology) -- History -- 20th century (23)
Haeckel, Ernst Heinrich Philipp August, -- 1834-1919 (23)
Knowledge, Theory of (23)
Reproduction (23)
Orchids (22)
Physics (22)
Birds (21)
Creationism (21)
Human genetics (21)
Hybridization, Vegetable (21)
Mammals (21)
Franklin, Benjamin, -- 1706-1790 -- Electricity (20)
Molds (Fungi) (19)
Psychology -- History (19)
Scientists (19)
Species (19)
Cirripedia (18)
Ecology (18)
Galton, Francis, -- Sir, -- 1822-1911 (18)
Literature -- Collections (18)
Plant breeding (18)
Science -- United States -- History (18)
Zoology -- History (18)
Animal ecology (17)
Glacial epoch (17)
Insects (17)
Literature -- Indexes (17)
Monism (17)
Natural theology (17)
Physiology (17)
Botany -- History (16)
Chromosomes (16)
Ethics (16)
Marx, Karl, -- 1818-1883 (16)
Publishers' advertisements -- 19th century. -- New York (N.Y.) (16)
Sexual selection in animals (16)
DNA (15)
Darwin, Charles, -- 1809-1882 -- Influence (15)
Evolution (Biology) -- History (15)
Medicine (15)
Naturalists -- Great Britain (15)
Science -- Great Britain -- History (15)
Bergson, Henri, -- 1859-1941 (14)
Botanists -- Great Britain -- Biography (14)
Civilization -- Early works to 1800 (14)
Darwin, Charles, -- 1809-1882 -- Bibliography (14)
Entomology (14)
Ethics, Evolutionary (14)
Evolution -- Congresses (14)
Materialism (14)
Philosophy -- History (14)
Physics -- History (14)
Technology -- History (14)
Zoogeography (14)
Astronomy -- History (13)
Evolution (Biology) -- Philosophy (13)
Intellect (13)
Language and languages (13)
Naturalists -- England -- Correspondence (13)
Nature (13)
Plants -- Assimilation (13)
Primates (13)
Vries, Hugo de, -- 1848-1935 (13)
Biologists (12)
Darwin, Charles, -- 1809-1882. -- Descent of man (12)
Deluge (12)
Eugenics -- History (12)
Human beings -- Effect of environment on (12)
Humboldt, Alexander von, -- 1769-1859 (12)
Literature and science (12)
Mammals, Fossil (12)
Naturalists (12)
Orchids -- Reproduction (12)
Philosophy and religion (12)
Physicians (12)
Physics -- Philosophy (12)
Science -- Early works to 1800 (12)
United States -- History (12)
Vertebrates (12)
Voyages around the world -- History -- 19th century (12)
Astronomy (11)
Genetics -- Russia (11)
Metaphysics (11)
Mind and body (11)
Paleontology -- Great Britain (11)
Physiology -- History (11)
Plurality of worlds (11)
Psychophysiology (11)
Religion (11)
Sex (Biology) (11)
Sex differences (11)
Sexual dimorphism (Animals) (11)
Social Darwinism (11)
Craniology (10)
Cuvier, Georges, -- baron, -- 1769-1832 (10)
Diseases -- Causes and theories of causation (10)
Earth (10)
Huxley, Thomas Henry, 1825-1895 (10)
Life (10)
Linné, Carl von, -- 1707-1778 (10)
Natural history -- History (10)
Newton, Isaac, -- Sir, -- 1642-1727 (10)
Prehistoric peoples -- China (10)
Science and state (10)
Vertebrates, Fossil (10)
Zoology -- Classification (10)
-- 20th century. -- Spain (Europe) (9)
Agassiz, Louis, -- 1807-1873 (9)
Animals, Domestic (9)
Botany -- Classification (9)
Buffon, Georges Louis Leclerc, -- comte de, -- 1707-1788 (9)
Butterflies (9)
Culture (9)
Descartes, René, -- 1596-1650 (9)
Education (9)
Evolution (Biology) -- Congresses (9)
Fertilisation of plants (9)
Fertilization of plants by insects (9)
Flowers (9)
History -- Philosophy (9)
Intellectual life -- History (9)
Lepidoptera (9)
Lysenko, Trofim Denisovich, -- 1898-1976 (9)
Malthus, T. R. -- (Thomas Robert), -- 1766-1834 (9)
Mimicry (Biology) (9)
Natural history -- Bibliography (9)
Natural selection -- History (9)
Patagonia (Argentina and Chile) -- Description and travel (9)
Philosophy, Modern (9)
Philosophy, Modern -- History (9)
Phylogeny (9)
Progress (9)
Science -- Philosophy -- History (9)
Science -- Russia -- History (9)
Sociobiology (9)
Teleology (9)
Theism (9)
Vitalism (9)
Weismann, August, -- 1834-1914 (9)
Bible and geology (8)
Breeding (8)
Darwin, Erasmus, -- 1731-1802 (8)
Evolution -- Philosophy (8)
Evolution -- Study and teaching (8)
Fisher, Ronald Aylmer, -- Sir, -- 1890-1962 (8)
Genetic psychology (8)
Genius (8)
Geological time (8)
Livestock (8)
Medicine Philosophy (8)
Molecular evolution. -- Philosophy (8)
Natural history -- Catalogs and collections (8)
Primulaceae (8)
Reality (8)
Technology and civilization (8)
Teeth (8)
United States -- Civilization (8)
Anatomy (7)
Anthropology, Prehistoric (7)
Archaeology (7)
Atoms (7)
Biometry (7)
Bones (7)
Brain (7)
Cytogenetics (7)
Cytology (7)
Demography (7)
East Indies -- Description and travel (7)
Freud, Sigmund, -- 1856-1939 (7)
Galapagos Islands (7)
Herschel, John F. W. -- (John Frederick William), -- Sir, -- 1792-1871 (7)
Historiography (7)
Immortality (7)
Law -- United States (7)
Longevity (7)
Mendel's law -- History (7)
Morphology (7)
Morphology (Animals) (7)
Nineteenth century (7)
Owen, Richard, -- 1804-1892 (7)
Paget, James, -- Sir, -- 1814-1899 -- Biography (7)
Paleontology History (7)
Plants -- Evolution (7)
Pollination (7)
Priestley, Joseph, -- 1733-1804. -- Unitarianism explained and defended (7)
Reptiles, Fossil (7)
Science -- History -- 19th century (7)
Science -- Victorian (7)
Scientists -- Biography (7)
Scientists -- Great Britain (7)
Time (7)
Vertebrates -- Anatomy (7)
Agnosticism (6)
Bacon, Francis, -- 1561-1626 (6)
Biology -- Social aspects (6)
Blyth, Edward, -- 1810-1873 (6)
Botany -- 19th Century (6)
Botany -- Evolution (6)
Chambers, Robert, -- 1802-1871. -- Vestiges of the natural history of creation (6)
Climatology (6)
Color of animals (6)
Cosmogony (6)
Darwin, Charles, -- 1809-1882 -- Congresses (6)
Darwin, Charles, -- 1809-1882. -- Journal of researches (6)
Einstein, Albert, -- 1879-1955 (6)
Evolution -- Bibliography (6)
Evolution -- Religious aspects (6)
Franklin, Benjamin, -- 1706-1790 -- Population (6)
Freshwater animals (6)
Genetics -- Dictionaries (6)
Genetics -- Russia -- History (6)
Genetics, Human (6)
Gray, Asa, -- 1810-1888 -- Biography (6)
Growth (6)
Human genetics -- Social aspects (6)
Huxley, Thomas Henry, -- 1825-1895 -- Biography (6)
Inventions -- History (6)
Logic (6)
Medical genetics (6)
Monkeys (6)
Monogenism and polygenism (6)
Muller, H. J. -- (Hermann Joseph), -- 1890-1967 (6)
Naturalists -- Biography. -- England (6)
Naturalists -- England (6)
Oceanography (6)
Oceanography -- History (6)
Oenothera (6)
Philosophy, American (6)
Physiologists (6)
Probabilities (6)
Psychiatry -- History (6)
Psychoanalysis (6)
Publishers' advertisements -- 20th century. -- Spain (6)
Radiation (6)
Recombinant DNA (6)
Religion -- Philosophy (6)
Romanes, George John, -- 1848-1894 (6)
Science -- Study and teaching (6)
Science and the humanities (6)
Socialism (6)
Ability (5)
Adventure and Beagle Expedition, 1826-1830 (5)
American Philosophical Society. -- Library. -- Manuscript collection (5)
Anthologies (5)
Ants (5)
Bees (5)
Biochemistry -- History (5)
Biology -- Bibliography (5)
Biology -- Classification (5)
Biophysics (5)
Birds -- Bibliography (5)
Botanists -- United States -- Biography (5)
Brain -- Evolution (5)
Brazil -- Description and travel (5)
Chemistry -- History (5)
Chile -- Description and travel (5)
Civilization -- Philosophy (5)
Consciousness (5)
Continents (5)
Curiosities and wonders (5)
Darwin, Charles, -- 1809-1882. -- Expression of the emotion in man and animals (5)
Down house (5)
Earth -- Age (5)
Embryology, Human (5)
Entomologists (5)
Ethnology -- History (5)
Evolution (Biology) -- History -- Congresses (5)
Evolutionary genetics (5)
Expression (5)
Franklin, Benjamin, -- 1706-1790 -- Animal magnetism (5)
Free will and determinism (5)
Funafuti Atoll (Tuvalu) (5)
Geoffroy Saint-Hilaire, Etienne, -- 1772-1844 (5)
Geologists -- Great Britain -- Biography (5)
Geology, Stratigraphic (5)
Glaciers (5)
Goethe, Johann Wolfgang von, -- 1749-1832 (5)
Great Britain -- Biography (5)
Great Britain -- Civilization (5)
Great Britain -- Intellectual life (5)
Harvey, William, -- 1578-1657 (5)
Human population genetics (5)
Lipari Islands (Italy) (5)
Lyell, Charles, -- Sir, -- 1797-1875. -- Principles of geology (5)
Malay Archipelago -- Description and travel (5)
Marine biology -- History (5)
Mathematics -- History (5)
Modernist-fundamentalist controversy (5)
Molecular genetics (5)
Mythology (5)
Müller, F. Max -- (Friedrich Max), -- 1823-1900 -- Biography (5)
Natural history -- Collected works (5)
Natural history -- Malay Archipelago (5)
Naturalism (5)
Naudin, Charles, -- 1815-1899 (5)
Nebular hypothesis (5)
Ocean (5)
Paleobotany (5)
Paleontology -- Early works to 1800 (5)
Philosophical anthropology (5)
Philosophy, Ancient (5)
Physical anthropology (5)
Poultry -- Breeding (5)
Publishers' advertisements 19th century. England|London (5)
Relativity (Physics) (5)
Science -- France -- History (5)
Science -- Germany -- History (5)
Science, Ancient (5)
Teilhard de Chardin, Pierre, -- 1881-1955 (5)
United States -- Intellectual life (5)
Values (5)
Variation (Genetics) (5)
Vivisection (5)
Worms (5)
Adaptation, Biological (4)
Animals -- Abnormalities (4)
Animals in literature (4)
Astronomy -- Early works to 1800 (4)
Atheism (4)
Aveling, Edward Bibbins, -- 1851-1898 (4)
Barnacles (4)
Bateson, William, -- 1861-1926 (4)
Beagle (Ship) (4)
Bible and evolution (4)
Biology -- Great Britain -- History (4)
Biology Congresses (4)
Birds -- Physiology (4)
Boas, Franz, -- 1858-1942 (4)
Botanists (4)
Botany -- Great Britain (4)
Bradlaugh, C. -- (Charles), -- 1833-1891. -- biography (4)
British Museum (Natural History) (4)
Broadsides (4)
Bryan, William Jennings, -- 1860-1925 (4)
Butler, Samuel, -- 1835-1902 (4)
Causation (4)
Chance (4)
Chimpanzees (4)
Cirripedia, Fossil (4)
Classification of sciences (4)
Coleridge, Samuel Taylor, -- 1772-1834 (4)
Cope, E. D. -- (Edward Drinker), -- 1840-1897 (4)
Coral reefs and islands -- Pacific Ocean (4)
Corals (4)
Creative ability in science (4)
Cybernetics (4)
Darwin, Charles, -- 1809-1882 -- Correspondence -- Catalogs (4)
Darwin, Erasmus, 1731-1802 Biography (4)
Death (4)
Dew (4)
Dialectical materialism (4)
Dinosaurs (4)
Downe (England) -- History (4)
Eighteenth century (4)
Embryology -- History (4)
Enlightenment (4)
Entomology -- History (4)
Equality (4)
Evolution (Biology) -- Juvenile literature (4)
Fingerprints (4)
Franklin, Benjamin, -- 1706-1790 -- France (4)
Galton, Francis, Sir, 1822-1911 Biography (4)
Genetics, Medical (4)
Geography -- History (4)
Geologists (4)
Geology -- England (4)
Geology -- Great Britain (4)
Gray, Asa, -- 1810-1888 (4)
Haeckel, Ernst Heinrich Philipp August, -- 1834-1919 -- Biography (4)
Haldane, J. B. S. -- (John Burdon Sanderson), -- 1892-1964 (4)
Heredity -- History (4)
Herschel, William, -- Sir, -- 1738-1822 (4)
History of Medicine (4)
Hooker, Joseph Dalton, -- Sir, -- 1817-1911 (4)
Horticulture (4)
Human ecology (4)
Hunter, John, -- 1728-1793 -- Biography (4)
Huxley, Thomas Henry, -- 1825-1895 -- Bibliography (4)
Indo-Europeans (4)
Islands (4)
Kelvin, William Thomson, -- Baron, -- 1824-1907 (4)
Life on other planets (4)
Matter (4)
Matter -- Properties (4)
Memory (4)
Methodology (4)
Microscopy -- Early works to 1800 (4)
Molecular biology -- History (4)
Morgan, Thomas Hunt, -- 1866-1945 (4)
Naturalists -- Correspondence (4)
Naturalists -- England -- Biography -- Congresses (4)
Naturalists -- Great Britain -- Correspondence (4)
Nature and nurture (4)
Oceanography -- Research (4)
Paleontology -- India (4)
Pantheism (4)
Parthenogenesis in animals (4)
Pathology (4)
Personality (4)
Philosophy, French (4)
Physics -- Early works to 1800 (4)
Physiology, Comparative (4)
Pigeons (4)
Plant ecology (4)
Plant genetics (4)
Prehistoric peoples -- South Africa (4)
Romanes, George John, -- 1848-1894 -- Biography (4)
Science Biography (4)
Science Philosophy (4)
Science and state -- Russia (4)
Science and state -- United States (4)
Scientists -- Great Britain -- Biography (4)
Scopes, John Thomas, -- d. 1970 -- Trials, litigations, etc (4)
Selection (Genetics) (4)
Social Darwinism -- History (4)
Social classes (4)
Social psychology (4)
Social sciences -- History (4)
Social sciences -- Methodology (4)
Stars (4)
Surgeons -- Biography (4)
Teratology (4)
Transmutation of animals (4)
United States -- Historiography (4)
Universities and colleges -- United States -- History (4)
Vertebrates, Fossil -- Bibliography (4)
Voyages and travels (4)
Wallace, Alfred Russel, 1823-1913 (4)
Wallace, Alfred Russel, 1823-1913 Biography (4)
Zoological Society of London (4)
Zoology -- Bibliography (4)
Zoology -- South America (4)
Zoology -- Variation (4)
Abnormalities, Human (3)
Agriculture (3)
American Civil Liberties Union (3)
American Philosophical Society. -- Library -- Catalogs (3)
Anatomy, Comparative -- History (3)
Angiosperms (3)
Animal migration (3)
Animals -- Folklore (3)
Animals, Fossil (3)
Anthropology -- Bibliography (3)
Anthropology -- Philosophy (3)
Anthropology -- United States -- History (3)
Aristotle (3)
Arkansas (3)
Astrology -- History (3)
Autographs (3)
Baer, Karl Ernst von, -- 1792-1876 (3)
Banks, Joseph, -- Sir, -- 1743-1820 (3)
Barber, Herbert Spencer, -- 1882-1950. -- Biography (3)
Behavior genetics (3)
Behaviorism (Psychology) (3)
Bernard, Claude, -- 1813-1878 (3)
Biologists -- Russia (3)
Biology -- History -- Bibliography (3)
Biology -- Philosophy -- History (3)
Biology -- Russia -- History (3)
Biology -- United States -- History (3)
Biomathematics (3)
Birds -- Anatomy (3)
Birds -- Galapagos Islands (3)
Birds -- Great Britain (3)
Birds -- United States (3)
Birds, Fossil (3)
Birth control (3)
Botanists -- England (3)
Botany -- Morphology (3)
Botany -- South America (3)
Botany 19th Century (3)
Botany, Economic (3)
Boulders (3)
British Museum (3)
Brooks, William Keith, -- 1848-1908 (3)
Burbank, Luther, -- 1849-1926 (3)
Cape Verde (3)
Cavendish, Henry, -- 1731-1810 (3)
Challenger Expedition, 1872-1876 (3)
Civilization, Modern (3)
Communism (3)
Cooperation (3)
Craniology -- South Africa (3)
Creation -- Early works to 1800 (3)
Creationism -- History (3)
Crustacea (3)
DNA -- History (3)
Darwin family (3)
Darwin, Charles, -- 1809-1882 -- Correspondence (3)
Darwin, Charles, -- 1809-1882 -- Manuscripts -- Catalogs (3)
Darwin, Charles, -- 1809-1882. -- Papers (3)
Darwin, Charles, -- 1809-1882. -- Queries about expression for anthropological inquiry (3)
Darwin, Charles, 1809-1882. Evolution by natural selection. Foreword. 1958 (3)
Darwin, Charles, 1809-1882. Selected works (3)
Darwin, Robert Waring, -- 1766-1848 (3)
Dewey, John, -- 1859-1952 (3)
Dialectic (3)
Drosophila (3)
Earth -- Early works to 1800 (3)
Earth sciences (3)
Education -- Philosophy (3)
Education -- United States (3)
Education, Higher (3)
Educational psychology (3)
England -- Social life and customs (3)
English literature -- 19th century -- History and criticism (3)
Ethics -- History (3)
Eugenics -- Congresses (3)
Europe -- Intellectual life (3)
Evolution (Biology) -- Collected works (3)
Evolution (Biology) -- Religious aspects (3)
Evolution -- Germany -- History (3)
Evolution -- Great Britain -- History (3)
Evolution -- History (3)
Evolution -- Japan -- History (3)
Evolution -- Religious aspects -- Christianity (3)
Evolution -- Russia -- History (3)
Evolution -- United States -- History (3)
Faraday, Michael, -- 1791-1867 (3)
Fawcett, Henry, -- 1833-1884. -- Biography (3)
Fertilization (Biology) (3)
Finches (3)
Fishes (3)
Flax (3)
Fossils (3)
Franklin, Benjamin, -- 1706-1790 -- Lightning conductors (3)
Galton, Francis, -- Sir, -- 1822-1911 -- Bibliography (3)
Gandhi, -- Mahatma, -- 1869-1948 (3)
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Geneticists -- Austria -- Biography (3)
Genetics 19th Century (3)
Geologists -- Great Britain (3)
Geology -- Australia (3)
Geology -- Scotland (3)
God (3)
Grant, Robert Edmond, -- 1793-1874 (3)
Great Britain -- History (3)
Great Britain -- History -- Victoria, 1837-1901 (3)
Great Britain -- Social life and customs (3)
Gulick, John Thomas, -- 1832-1923 (3)
Hair (3)
Heredity -- Bibliography (3)
History (3)
Human behavior (3)
Human evolution -- Congresses (3)
Human evolution -- Philosophy (3)
Human geography (3)
Human skin color (3)
Humanities (3)
Hume, David, -- 1711-1776 (3)
Huxley, Thomas Henry, 1825-1895 Biography (3)
Icebergs (3)
Inventions (3)
James, William, -- 1842-1910 (3)
John Murray Publishers Ltd (3)
Kant, Immanuel, -- 1724-1804 (3)
Lamarck, Jean Baptiste Pierre Antoine de Monet de, 1744-1829 (3)
Lavoisier, Antoine Laurent, -- 1743-1794 (3)
Lawrence, William, -- 1791-1867 (3)
Linné, Carl von, -- 1707-1778 -- Bibliography (3)
Linné, Carl von, -- 1707-1778 -- Biography (3)
Lister, Joseph, -- Baron, -- 1827-1912 -- Biography (3)
Locke, John, -- 1632-1704 (3)
Logic, Symbolic and mathematical -- History -- 18th century (3)
Lubbock, John, -- Sir, -- 1834-1913 (3)
Luminescence (3)
Mach, Ernst, -- 1838-1916 (3)
Mach, Ernst, -- 1838-1916 -- Bibliography (3)
Manuscripts -- Great Britain -- Catalogs (3)
Manuscripts, English -- Pennsylvania -- Philadelphia -- Catalogs (3)
Marine animals (3)
Marx, Karl, 1818-1883. Correspondence (3)
Mathematical statistics (3)
Mathematics (3)
Mathematics -- Philosophy (3)
Medicine -- Research (3)
Medicine -- Study and teaching -- History (3)
Medicine -- United States (3)
Medicine, Experimental (3)
Mendel, Gregor, -- 1822-1884. -- Versuche über Pflanzenhybriden (3)
Mentally ill -- Care -- History (3)
Microbiology -- History (3)
Miracles (3)
Muscles (3)
Mutagenesis (3)
Mutation (Biology) (3)
Müller, Fritz, 1822-1897 (3)
Nationalism (3)
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Natural history -- East Indies (3)
Natural history -- Galapagos Islands (3)
Natural history -- Sources -- Bibliography -- Catalogs (3)
Natural law (3)
Natural selection -- History -- 19th century (3)
Naturalists -- England -- Correspondence -- Catalogs (3)
Naturalists -- France -- Biography (3)
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Nature in literature (3)
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Paleontology -- Europe (3)
Paleontology -- South America (3)
Papaveraceae (3)
Parapsychology -- Research (3)
Peirce, Charles S. -- (Charles Sanders), -- 1839-1914 (3)
Penguins (3)
Peru -- Description and travel (3)
Philosophy -- United States -- History (3)
Philosophy of nature (3)
Photography of birds (3)
Physical geography (3)
Piltdown forgery (3)
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Weidenreich, Franz, -- 1873-1948 -- Biography (1)
Weismann, August, -- 1834-1914. -- Studien zur Descendenz-Theorie (1)