Pilsbry, Henry Augustus,  1862- <br/><br/>
Land Mollusca of North America (north of Mexico) 
by Henry A. Pilsbry 
 - Philadelphia  Encouragement od Original Scientific Research  1939 
 - 2 v. : ill. ; 28 cm. 
 - Academy of Natural Sciences of Philadelphia. Monographs, no.3. .
<br/><br/><label>LCCN: </label>40-005753 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mollusks--North America