TY  - BOOK
AU  - Sullivan,Navin
AU  - Petie,Haris
TI  - Animal timekeepers
T2  - P-H junior research books
AV  - PZ10.S9 An
U1  - j591.5 
PY  - 1966///]
CY  - Englewood Cliffs, N. J.
PB  - Prentice-Hall
KW  - Biology
KW  - Periodicity
KW  - Juvenile literature
ER  -