| Danny Lyon Smelter Cemetery, where employees of the Asarco Smelter Works (in background) can be buried 1972, April Colour photograph National Archives and Records Administration Records of the Environmental Protection Agency (ARC Identifier 545363 / Local Identifier 412-DA-2870) LL/50024 Series: DOCUMERICA: The Environmental Protection Agency's Program to Photographically Document Subjects of Environmental Concern, compiled 1972 - 1977
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