Short manual on sampling  Volume 1 :  Elements of samole survey theory / 

 - New York :  Uniited nations,  1960. 
 - 214p. : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>statistical
<br/><br/><label>Dewey Class. No.: </label>311.21  / SHO/S