TY  - BOOK
AU  - Curtis,Helena
AU  - Barnes,N.Sue
TI  - Biology
SN  - 087901394X
AV  - QH308 .C83 1989
PY  - 1989///
CY  - New York, N.Y. 
PB  - Worth Publishers 
KW  - Biology
KW  - Biología
KW  - Genética
N1  - Includes bibliographies and index
ER  -