TY  - BOOK
AU  - Hyatt,D.E.
AU  - Gutenson,O.
TI  - Biological populations as indicators of environmental change: volume 1 
SN  - 0160426154
U1  - 577.2 23
PY  - 1992///
CY  - Washington, D. C., USA
PB  - U. S. Environmental Protection Agency
ER  -