Inquiry into strategic and critical material stockpiles of United States, hearings before National Stockpile and Naval Petroleum Reserves Subcommittee, 87th Congress, 2d session, on cadmium, Calumet & Hecla, Inc. (copper deferrals), Climax Molybdenum Co., synthetic cryolite. pt. 3. May 21-June 6, 1962.