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Dyfyniad Arddull ChicagoOgaja, Clement A. Applied GPS for Engineers and Project Managers. Reston, Va.: American Society of Civil Engineers, 2011.
Dyfyniad MLAOgaja, Clement A. Applied GPS for Engineers and Project Managers. American Society of Civil Engineers, 2011.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.