TY  - BOOK
AU  - Bick Harmut
TI  - Ciliated protozoa: An illustrated guide to the species used as biological indictors in freshwater biology
U1  - 579.49 
PY  - 1972///
CY  - Geneva
PB  - World Health Organization
KW  - Ciliata-identification
KW  - Indicators (Biology)
ER  -