Agor, R. A Text Book of Surveying and Levelling. Khanna Publications.
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Dyfyniad Arddull Chicago
Agor, R. A Text Book of Surveying and Levelling. New Delhi: Khanna Publications.
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Dyfyniad MLA
Agor, R. A Text Book of Surveying and Levelling. Khanna Publications.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.