Sturtevant, A. H. The North American species of Drosophila
(Washington : Carnegie Institution of Washington, 1921.)
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COLUMBIA UNIVERSITY LIBRARIES This book is due on the date indicated below, or at the expiration of a definite period after the date of borrowing, as provided by the library rules or by special arrangement with the Librarian in charge. DATE BORROWED DATE DUE DATE BORROWED DATE DUE hi'^t'Sra ^ W §'Sl '■0 C28 (665) 50M . |
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