Jahn, Theodore Louis,  1905- <br/><br/>
How to know the protozoa :  a pictured-key for identifying the mor e common fresh water, marine and parasitic protozoa, with elementary di scussions of the importance of each group and of interesting facts conc erning them / 
T.L. Jahn and Frances Floed Jahn. 
 - 2nd ed. 
 - Dubuque, Ia. :  W. C. Brow,  1949. 
 - 234 p. :  ill. ;  22cm. 
 - Pictured-key nature, series. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Protozoa.
<br/><br/><label>Dewey Class. No.: </label>593 JAH