"Hard Rocks, Hard Choices: Trade and Investment Policies for Non-Fuel Minerals," first draft of a report for review by the MacGregor Subcommittee and the Executive Committee [British-North American Committee], 15 October 1975

"Hard Rocks, Hard Choices: Trade and Investment Policies for Non-Fuel Minerals," first draft of a report for review by the MacGregor Subcommittee and the Executive Committee [British-North American Committee], 15 October 1975, Box: 14, Folder: 6. Guy F. Erb Records of the Mexico-U.S. Business Committee and Related Materials, 2004-54. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/450400 Accessed September 25, 2026.