TY  - BOOK
AU  - Hershler,Robert
TI  - A review of the North American freshwater snail genus Pyrgulopsis (Hydrobiidae)
T2  - Smithsonian contributions to zoology
AV  - QL1QL430.5.H9 .S54 no. 554
U1  - 591 s594/.3 20
PY  - 1994///
CY  - Washington, D.C.
PB  - Smithsonian Institution Press
KW  - Pyrgulopsis
KW  - North America
KW  - Classification
KW  - Local
N1  - Includes bibliographical references (p. 111-115)
ER  -