TY  - GEN
AU  - Andrews, William A.
AU  - McEwan, Sandra J.
TI  - Investigating aquatic ecosystems
SN  - 013503129X
U1  - 574.5263  
PY  - 1987///
CY  - Ontario : 
PB  - Prentice-Hall
KW  - Ecosystems
N1  - Includes index
ER  -