TY  - BOOK
AU  - Hopson, Janet L.
AU  - Wessells,Norman K.
TI  - Essentials of biology
SN  - 0075571080
AV  - QH 308.2 .H67 1990 
PY  - 1990///
CY  - New York
PB  - McGraw Hill
KW  - Biology
N1  - includes references
ER  -