TY  - BOOK
AU  - Clapham,Wentworth B.,1942-
TI  - Natural ecosystems
SN  - 0023225203
U1  - 577 
PY  - 1973///
CY  - New York
PB  - Macmillan
KW  - Ecology
KW  - Ecosystem
KW  - Ecosystems
N1  - Includes bibliographies and index
ER  -