871 resultados para underground mining
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"Issued: May 1, 1963"--Cover.
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Prepared for U.S. Atomic Energy Commission.
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Prepared for U.S. Atomic Energy Commission.
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Project Sedan.
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Project SEDAN.
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Part of the maps, plans and diagrams folded.
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At head of title: "Project Gnome" ; "PNE-150F."
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"January 1954."
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"February 1957."
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"This research was supported by the Advanced Research Projects Agency of the Department of Defense and was monitored by the Bureau of Mines ..."
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"August 1955."
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Map wanting.
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Mode of access: Internet.
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Mode of access: Internet.
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Hearings held Feb. 16, 1928-Feb. 15, 1929.