TY  - BOOK
AU  - Shefler,William C.
TI  - Biology: : principles and issues
SN  - 0201067641
AV  - ZOO QH308.2.S33 
PY  - 1976///
CY  - Massachusetts
PB  - Addison-Wesley Publishing Company
KW  - Biology
N1  - Includes bibliographies
ER  -