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There are a few old references in the GIS Master Bibliography (see URL
below).
 
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Duane F. Marble             E-mail:    [log in to unmask]
Dept. of Geography          Home Page: http://www.geography.ohio-state.edu
The Ohio State University   Telephone: (614) 292-2250
Columbus, OH 43210          Fax:       (614) 292-6213