TY  - BOOK
AU  - Mellanby,Helen
TI  - Animal life in fresh water: a guide to fresh-water invertebrates 
U1  - 591.929 
PY  - 1963///
CY  - London
PB  - Methuen
KW  - Freshwater animals
KW  - Invertebrates
N1  - Includes index
ER  -