00360nam a2200133 a 450000500170000002000150001708200160003210000240004824500240007225000120009626000310010830000240013949000630016320251203110738.0  a9971512718  a519.52bCOC  aCochran, William G.  aSampling techniques  a3rd ed.  aNew YorkbJohn Wileyc1977  axvi, 428p.c24cm PB  aWiley Series in Probability and Mathematical Statistics...