TY  - BOOK
AU  - Rpberts,R D  .
AU  - Roberts,T M  .
TI  - Planning and ecology / 
SN  - 0412284707
U1  - 333.7 
PY  - 1986///
CY  - New York : 
PB  - Chapman and hall , 
KW  - ECOLOGY
N1  - Includes index
ER  -