00266nam a2200109Ia 4500082001900000100002100019245006100040260003500101300001000136500000500146700000500151  a526.8bD553.SM  aDickinson, G. C.  aStatistical mapping and the presentation of statisticsb  aLondonbArnold-Heinemannc1968  a160p.  a  a