TY  - BOOK
AU  - Levins,Richard
TI  - Evolution in changing environments :  some theoretical explorations
U1  - 575 LEV  
PY  - 1968///.
CY  - New Jersey : 
PB  - Princeton University Press, 
KW  - Animal population genetics
KW  - Animal populations
N1  - Includes index.
ER  -