National Academy of Sciences. (1972). The earth and human affairs: Committee on geological sciences. Canfield Press.
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Dyfyniad Arddull Chicago
National Academy of Sciences. The Earth and Human Affairs: Committee on Geological Sciences. New York: Canfield Press, 1972.
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Dyfyniad MLA
National Academy of Sciences. The Earth and Human Affairs: Committee on Geological Sciences. Canfield Press, 1972.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.