Williston, Samuel Wendell  1851-1918 <br/><br/>
Manual of the families and genera of North American diptera/ 
by Samuel W.Williston 
 - 2nd ed. rewritten and enlarged 
 - liv, 167 pages;  20cm 
<br/><br/>Includes bibliographical references and indexes 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Diptera<br/>Diptera--North America
<br/><br/><label>National Library of Medicine Call No.: </label>QL531