TY  - BOOK
AU  - Isom, B. G.
TI  - Rationale for sampling and interpretation of ecological data in the assessment of freshwater ecosystems
SN  - 0803104553 (pbk.)
U1  - 628.1680287 
PY  - 1986///
CY  - Philadelphia, PA
PB  - American Society for Testing and Materials
KW  - Water quality biological assessment
KW  - Ecological assessment (Biology)
KW  - Freshwater ecology
N1  - "ASTM publication code number (PCN) 04-894000-16."
ER  -