Simpson, G. G. (1937). The Fort Union of the Crazy Mountain Field, Montana, and its mammalian faunas.
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Dyfyniad Arddull Chicago
Simpson, George Gaylord. The Fort Union of the Crazy Mountain Field, Montana, and Its Mammalian Faunas. Washington, 1937.
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Dyfyniad MLA
Simpson, George Gaylord. The Fort Union of the Crazy Mountain Field, Montana, and Its Mammalian Faunas. 1937.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.