na INLIS000000000000133 20250724090415 0010-0921000133 250724 g 0 eng id 519.243 519.243 COC s Cochran, William C. Sampling techniques / William C. Cochran New York : John Wiley & Sons Inc, 1953 xiv, 330 p : ill. ; 21 cm 519.243 COC s 0-471-16240-X Rak 1 Level 3 74/D/2008