TY  - BOOK
AU  - Silverstein, Alvin
AU  - Silverstein, Vitginia
AU  - Silverstein, Robery
TI  - The excretory system
SN  - 9780805028348
U1  - 573.49 23
PY  - 1994///
CY  - New York
PB  - Twent-first Century Books
KW  - Excretion
ER  -