Report 40 By Emil Blomquist, United States Geological Survey | February, 1967

• Report 40 - Progress of Topographic Mapping in Texas (pdf - 10.7MB)
• Plate 1 Status of Topographic mapping 1958
• Plate 2 Progress of Topographic mapping January to August 1958
• Plate 3 Texas mappign dvisory Committee Priority Requests 1967