00283nam a2200109Ia 4500082002500000100001500025245004000040260004300080300004000123500000500163700000500168  a309.100182bSi583.SC  aSilk, John  aStatistical concepts in Geographyb  aLondonbGeorge Allen & Unwin Ltdc1979  axv, 276p. Index, statistical tables  a  a