Helmholtz, Hermann von, 1821-1894.
De fabrica systematis nervosi evertebratorum.
Berolini, Nietackian [1842]
Diss. - Berlin.
MED,HSL 19th Cent QP6 H36 842: Photostat reproduction (positive) of the British museum copy.
Nervous system -- Invertebrates.
Invertebrates -- Anatomy.
Philadelphia Area Center for History of Science
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