Dilworth, J.R. <br/><br/>
Variable probability sampling :  variable plot and three-p 
/ by J.R. Dilworth and J.F. Bell. 
 - U.S.A :  O.S.U. Book Stores,  1985. 
 - ix, 130 p. ;  15 cm. 
<br/><br/><label>Dewey Class. No.: </label>519.2 DIL