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Gorr W. L., Allen D. W., . (20). GIS tutorial. Redlands, Calif: ESRI Press.
Gorr Wilpen L, Allen David W, . 20. GIS tutorial. Redlands, Calif: ESRI Press.
Gorr Wilpen L, Allen David W, . GIS tutorial. Redlands, Calif: ESRI Press. 20.