TY  - BOOK
AU  - Pimm Stuart L
TI  - Balance of nature? :  Ecological issues in the conservation of species and communities   
SN  - 0226668304
U1  - Y72:(G:5), N1/TD 
PY  - 1991///
CY  - Chicago
PB  - University Of Chicago Press       
KW  - Geography
ER  -