TY  - BOOK
AU  - Ricklefs, Robert E.  .
TI  - Economy of nature: a textbook in basic ecology / 
SN  - 0-7167-2815-X
U1  - G:5(X) 
PY  - 1997///
CY  - New York : 
PB  - W.H.Freeman and Company , 
KW  - Ecology
ER  -