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Dyfyniad Arddull ChicagoHall, G Brent, and Michael G. Leahy. Open Source Approaches in Spatial Data Handling. Berlin: Springer, 2008.
Dyfyniad MLAHall, G Brent, and Michael G. Leahy. Open Source Approaches in Spatial Data Handling. Springer, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.