Calkins, Cary Nathan <br/><br/>
Protozoa in biological research 

 - New York  Hafner Publishing Company  1941 
 - xii,1148p.  24cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Protozoa
<br/><br/><label>LC Class. No.: </label>QL366.C15