Morgan, R. P. C. (1979). Soil Erosion. Longman.
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Dyfyniad Arddull Chicago
Morgan, R. P. C. Soil Erosion. London: Longman, 1979.
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Dyfyniad MLA
Morgan, R. P. C. Soil Erosion. Longman, 1979.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.