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PUBLICATIONS FOR SALE BY THE CONCHOLOGIOAL SECTION, ACADEMY 
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STRUCTURAL AND SYSTEMATIC CONCHOLOGY, 
A Guide to the Study of Mollusca 
BY GEO. W. TRYON, Jr. 
CHEAP EDITION. Text on thin paper. Illustrations (printed on both sides of the pages), 
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MAIN WU Ac OF Gowicrrotecy- 
BY GEO. W. TRYON, Jr. 
Continuation by HENRY A. PILSBRY. 
FIRST SERIES. —Marine univalves, Vols I to X. 
SECOND SERIES.—Terrestrial Mollusks, Vols. I to V. 
Address for circulars giving contents, 
S. RAYMOND ROBERTS, 
Treasurer Conchological Section, 
Logan Square, Philada., Pa Philada. Acad. Nat. Sciences. 
