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Dyfyniad APA
Thompson Morris Mordecai. (1979). Maps for America. U.S. Geological Survey.
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Dyfyniad Arddull Chicago
Thompson Morris Mordecai. Maps for America. U.S. Geological Survey, 1979.
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Dyfyniad MLA
Thompson Morris Mordecai. Maps for America. U.S. Geological Survey, 1979.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.