00000nam a2200000 a 4500 20251203090634.0 519.52, COC/ECP COCHRAN WILLIAM, G. SAMPLING TECHNIQUES DELHI WILEY EASTERN 1987 XVI,428P., 22CM. MATHEMATICS DOURLE SAMPLING SAMPLING TECHNIQUES SURRVEY ERROS SUB SAMPLING _ 27547 W 14681 14681 2 0 0 0 PU PU 1998-04-09 0 519.52, COC/ECP 27547 BK