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Index map, topographic map (gel-lithograph, color); 17 13/16 x 32 15/16 inches, scale 1:1,000,000., 1949-10-01, CAC_CC_047_5_0000, Box 1, University of Oklahoma, Carl Albert Center Archives, Norman, OK, Standard Shelving, George B. Schwabe Collection, Carl Albert Congressional Research and Studies Center, University of Oklahoma, Norman, OK. https://congressarchives.org/catalog/CAC_CC_047_5_0000_1_0006 (accessed March 22, 2026).
Note: These citations are programmatically generated and may be incomplete.