00274nam a2200109Ia 4500008004100000020001500041082002000056100001200076245002500088260003800113300001300151161229s9999    xx            000 0 und d  a9971512718  a001.4222 COC/SA  aCochran  aSampling techniques   bJohn Wiley & SonsaNew Yorkc1977  axvi, 428