00288nam a2200133Ia 4500020000900000082001100009100002000020245004900040250000800089260003400097300000800131500000900139650000600148  aNULL  a519.93  aSukhatme, P. V. 0aSampling Theory Of Surveys With Applications  a2nd  aBombaybAsia Publishing House  a452  a1992  a-