Erdos, Paul L. <br/><br/>
Professional mail surveys / 
by Paul L. Erdos, with the assistance of Arthur J. Morgan. 
 - New York :  McGraw-Hill,  c1970. 
 - xi, 289 p. :  illus., forms. ;  26 cm. 
<br/><br/>Bibliography: p. 276-277 & Includes Index. 
<br/><br/><label>ISBN: </label>070195706 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mail surveys.<br/>Social surveys.<br/>Public opinion polls.
<br/><br/><label>Dewey Class. No.: </label>658.83  / ERP 1970