=LDR 22 4500 =001 6396 =082 04$a519.52 COC =100 1\$aCochran, W.G. =245 10$aSampling Techniques =260 \\$aChichester :$bWiley,$c1963 =650 \0$aBooks =852 \\$bGeography Basement$h519.52 COC