TY  - BOOK
AU  - Williams, W. D.
TI  - Textbook of zoology invertebrates
SN  - 8174730311
U1  - 592 
PY  - 1005///
CY  - Delhi
PB  - A. I. T. B. S. Publishers & Distributors
KW  - Zoology
KW  - Invertebrates
N1  - It includes bibliographical information and index
ER  -