00366nam a2200121Ia 4500082001500000100002900015245010100044260002400145300000900169500000500178700003100183700003000214  aSA.6bR215  aRao, J. N. K. and Others  aVariance estimation with one unit per stratumbcBy J. N. K. Rao, H. O. Hartley and Grace Kiefer  aCalcuttabISIc1969  a25p.  a  aHartley, H. O. ; jt. auth.  aKiefer, Grace ; jt. auth.