TY  - BOOK
AU  - Mellanby, Helen;
AU  - Eastham, L. E. S. 
TI  - Animal life in fresh water : a guide to fresh-water invertebrates
SN  - 9780412213601
PY  - 1975///
CY  - London 
PB  - : Chapman and Hall, 
KW  -  Freshwater animals.
ER  -