Donaldson, F. (1912). Practical Shaft Sinking. McGraw-Hill.
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Dyfyniad Arddull Chicago
Donaldson, Francis. Practical Shaft Sinking. New York: McGraw-Hill, 1912.
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Dyfyniad MLA
Donaldson, Francis. Practical Shaft Sinking. McGraw-Hill, 1912.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.