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Dyfyniad Arddull ChicagoSharma , H. S. Mathematical Modelling in Geographical Information System Global Positioning System and Digital Cartography. New Delhi: CPC, 2006.
Dyfyniad MLASharma , H. S. Mathematical Modelling in Geographical Information System Global Positioning System and Digital Cartography. CPC, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.