Cofnodi Dyfyniadau
Dyfyniad APA
Root Samuel I. (1971). Geology and mineral resources of Northeastern Franklin County, Pennsylvania. Department of Environmental Resources.
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Dyfyniad Arddull Chicago
Root Samuel I. Geology and Mineral Resources of Northeastern Franklin County, Pennsylvania. Department of Environmental Resources, 1971.
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Dyfyniad MLA
Root Samuel I. Geology and Mineral Resources of Northeastern Franklin County, Pennsylvania. Department of Environmental Resources, 1971.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.