TY  - BOOK
AU  - Clapham, W. B.
TI  - Natural Ecosystems
U1  - 574.524 
PY  - 1973///
CY  - New York
PB  - Macmillan Publishing Co., Inc.
KW  - Life sciences
KW  - Pure Sciences
KW  - Ecology
KW  - Ecosystems
ER  -