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12by United States. Works Progress Administration of Pennsylvania.“...Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps...”
Published 1934
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13by United States. Works Progress Administration of Pennsylvania.“...Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps...”
Published 1934
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14by United States. Works Progress Administration of Pennsylvania.“...Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps...”
Published 1934
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15by United States. Works Progress Administration of Pennsylvania.“...Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps...”
Published 1934
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16by United States. Works Progress Administration of Pennsylvania.“...Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps...”
Published 1934
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17by United States. Works Progress Administration of Pennsylvania.“...Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps...”
Published 1934
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18by United States. Works Progress Administration of Pennsylvania.“...Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps...”
Published 1934
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Still Image -
19by United States. Works Progress Administration of Pennsylvania.“...Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps...”
Published 1934
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Still Image -
20by United States. Works Progress Administration of Pennsylvania.“...Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps...”
Published 1934
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Still Image