Langbein, Laura Irwin  <br/><br/>
Ecological inference / 
by Laura Irwin Langbein and Allan J Lichtman 
 - New Delhi :  Sage Publications,   1978. 
 - 70p. : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecological inference
<br/><br/><label>Dewey Class. No.: </label>300.182  / LAN.E