APA

United States, . (1949). Mineral resources development: hearings, 81st Congress, 1st session, on S. 240, S. 2105, S. 2230, and S. 2320, July 15, 16, 19, 30, and Aug. 5, 1949. [Washington, D.C.]: .

Chicago

United States, . 1949. Mineral resources development: hearings, 81st Congress, 1st session, on S. 240, S. 2105, S. 2230, and S. 2320, July 15, 16, 19, 30, and Aug. 5, 1949. [Washington, D.C.]: .

Harvard

United States, . (1949). Mineral resources development: hearings, 81st Congress, 1st session, on S. 240, S. 2105, S. 2230, and S. 2320, July 15, 16, 19, 30, and Aug. 5, 1949. [Washington, D.C.]: .

MLA

United States, . Mineral resources development: hearings, 81st Congress, 1st session, on S. 240, S. 2105, S. 2230, and S. 2320, July 15, 16, 19, 30, and Aug. 5, 1949. [Washington, D.C.]: . 1949.