http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
hearings, Ninety-first Congress, first session ... November 13 and 14, 1969
Committee on Interior and Insular Affairs.
Subcommittee on Minerals, Materials, and Fuels.
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United States. Congress. Senate. Committee on Interior and Insular Affairs. Subcommittee on Minerals, Materials, and Fuels.