TY  - BOOK
AU  - Beck,Stanley D.
TI  - Animal photoperiodism; relationship of daylength to animal growth, development, and behavior
T2  - Holt library of science. Series 1 [no.] 1
AV  - QP82 .B4
U1  - 591.51 
PY  - 1963///]
CY  - New York
PB  - Holt, Rinehart and Winston
KW  - Photoperiodism
N1  - Bibliography: p. 117-118
ER  -