Metcalf, Zeno Payne,  1885-1956. <br/><br/>
A key to the principal orders and families of insects, 
by Z.P. Metcalf ... and C.L. Metcalf. 
 - Third edition, revised and illustrated. 
 - [Urbana? Ill.]  The authors  [c1928] 
 - 23 p.  illus  28 cm. 
<br/><br/>Bibliography: p. [3] 
<br/><br/><label>LCCN: </label>agr30001354  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Insects.
<br/><br/><label>LC Class. No.: </label>QL468  / .M4 1928