TY  - BOOK
AU  - Hopson, Janet L.
AU  - Wessells, Norman K.
TI  - Essentials of Biology
SN  - 0075571080
U1  - 574 
PY  - 1990///
CY  - America
PB  - Mc Graw Hill
KW  - Biology
KW  - Study and teaching
N1  - Include Index
ER  -