Letter from the Secretary of the Interior, transmitting a copy of a communication from the director of the Geological Survey submitting a report on the progress of the investigation of the electric smelting of iron ores (included in the investigation of the Black Sands of the Pacific Slope), etc. [electronic resource].
- Washington : [s.n.], 1907.
- Government document
33 p. : digital, PDF file.
- LexisNexis U.S. Serial Set Digital Collection
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