TY  - BOOK
AU  - Berryman Alan A
TI  - Population systems:  A general introduction   
T2  - Population Ecology: Theory and Application
SN  - 030640589X
U1  - Y:5:(B), M1 
PY  - 1981///
CY  - New York
PB  - Plenum Press        
KW  - Family Planning
ER  -