TY  - BOOK
AU  - Fretwell,Stephen D.
TI  - Populations in a seasonal environment
SN  - 0691081050 :
U1  - 574.52 
PY  - 1972///
CY  - Princeton, N. J.
PB  - The University Press
KW  - Animal Populations
KW  - Phenology
KW  - Population
KW  - Environmental aspects
ER  -