Strategic and critical minerals and metals : Hearings before the Subcommittee on Mines and Mining of the Committee on Public Lands, House of Representatives, Eightieth Congress, second session.
pt. 1. Manganese. Feb. 12-27, 1948.--pt. 2. Chromite. Mar. 29-31, 1948.--pt. 3. Copper. Apr. 15-16, May 20 and 28, 1948.--pt. 4. Preliminary review of the problems of the tungsten and mercury mining industries. Mar. 31 and May 20, 1948.--pt. 5. Stockpiling. May 3 and 6, 1948.