Computer programming for geographers / David J. Unwin and John A. Dawson. Unwin, D. (David John) Dawson, John A. Geography Data processing. G70.2 .U58 1985 001.6424 19 UNC Includes index. Bibliography: p. [240]-246. London ; New York : Longman, 1985. 1985. 1985 Text xii, 252 p. ; eng