TY  - BOOK
AU  - Jahn,Theodore Louis
AU  - Jahn,Frances Floed
TI  - How to know the Protozoa: a pictured-key for identifying the more common fresh water, marine, and parasitic Protozoa, with elementary discussions of the importance of each group and of interesting facts concerning them 
T2  - Pictured-key nature series
U1  - 593 
PY  - 1949///
CY  - Dubuque
PB  - W. C. Brown
KW  - Protozoa
N1  - Includes index
ER  -