Lewis, R. S., & Clark, G. B. (1964). Elements of mining (3rd ed.). John Wiley & Sons.
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Dyfyniad Arddull Chicago
Lewis, Robert S., and George B. Clark. Elements of Mining. 3rd ed. New York: John Wiley & Sons, 1964.
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Dyfyniad MLA
Lewis, Robert S., and George B. Clark. Elements of Mining. 3rd ed. John Wiley & Sons, 1964.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.