TY  - BOOK
AU  - Pennak,Robert W.
TI  - Fresh-water invertebrates of the United States: protozoa to mollusca 
SN  - 0471631183
U1  - 592.0973 23
PY  - 1989///
CY  - New York, Chichester
PB  - Wiley
KW  - Freshwater invertebrates
KW  - United States
N1  - "A Wiley-Interscience publication."; Includes bibliographies
ER  -