TY  - BOOK
AU  - Wallace, Robert L.; Taylor, Water K. & Litton, James R.
TI  - Back and Braithwaite's  Invertebrate zoology
SN  - 0-02-307763-8
U1  - 592.072 Wal 
PY  - 1989///
CY  - Macmillan Publishing company, New York
ER  -