TY  - BOOK
AU  - Pennak,Robert W.
TI  - Fresh-water invertebrates of the United States
U1  - 592 
PY  - 1978///
CY  - New York
PB  - Wiley
KW  - Freshwater invertebrates
KW  - United States
N1  - "A Wiley-Interscience publication."
ER  -