Merkoša sitáhtat
APA-čujuhus (7. p.)
Root Samuel I. (1971). Geology and mineral resources of Northeastern Franklin County, Pennsylvania. Department of Environmental Resources.
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Chicago-čujuhus (17. p.)
Root Samuel I. Geology and Mineral Resources of Northeastern Franklin County, Pennsylvania. Department of Environmental Resources, 1971.
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MLA-čujuhus (9. p.)
Root Samuel I. Geology and Mineral Resources of Northeastern Franklin County, Pennsylvania. Department of Environmental Resources, 1971.
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