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Earth -- Miscellanea (1)
Earth -- Rotation[X]
1Title:  Is the duration of the mean solar second longer than it should be?   
 Creator:  Liva, Henry. 
 Publication:  New York, 1940] 
 Extent:  7 p. ; 21 cm. 
 Subjects:  Earth -- Rotation | Earth -- Miscellanea

Collection:  American Philosophical Society 
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