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21by United States. Works Progress Administration of Pennsylvania.Subjects: “...Bituminous coal--Pennsylvania--Maps...”
Published 1934
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22by United States. Works Progress Administration of Pennsylvania.Subjects: “...Bituminous coal--Pennsylvania--Maps...”
Published 1934
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23by United States. Works Progress Administration of Pennsylvania.Subjects: “...Bituminous coal--Pennsylvania--Maps...”
Published 1934
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24by United States. Works Progress Administration of Pennsylvania.Subjects: “...Bituminous coal--Pennsylvania--Maps...”
Published 1934
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Still Image