Stockpile and Accessibility of Strategic and Critical Materials to the United States in Time of War: Hearings Before the Special Subcommittee on Minerals, Materials and Fuel Economics of the Committee on Interior and Insular Affairs, United States Senate, Eighty-third Congress, First[-second] Session, Pursuant to S. Res. 143, a Resolution to Investigate the Accessibility and Availability of Supplies of Critical Raw Materials..., Part 1