000			00302 a2200121 4500
080			_a519 _bC 663 S
245	1		_aSampling techniques _cby W.G. Cochran
260			_aBombay _bAsia Publishing House _c1962
650			_aSampling Techniques
100	1		_aCochran, W.G. _d
300			_a330 p.
901			_a77974
999			_c25252 _d25252