883 resultados para conservation and use


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Running title: Lignite investigations, 1918 to 1925.

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Transportation Department, Office of Environmental Affairs, Washington, D.C.

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Transportation Department, Office of Environmental Affairs, Washington, D.C.

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Transportation Department, Office of Environmental Affairs, Washington, D.C.

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Transportation Department, Office of Environmental Affairs, Washington, D.C.

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Transportation Department, Office of Environmental Affairs, Washington, D.C.

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Based on a presentation to the Second Studio Seminar for Federal Graphic Designers, Nov. 9, 1976, held at the Illinois Institute of Technology.