01001cam a22002531a 4500 gs 29000242 DLC 20260227111333.0 821220s1929 sa abf 000 0 eng c gs 29000242 (OCoLC)9069974 U.S. Geological Survey, Library PPAN OCoLC DLC premarc TN490.M3 N4 Nel, Louis T. (Louis Taylor), 1895- The geology of the Postmasburg manganese deposits and the surrounding country. An explanation of the geological map / by Louis T. Nel. Pretoria : The Government printer, 1929. 109 p., [XII] leaves of plates : ill., map ; 25 cm. At head of title : Union of South Africa. Department of mines and industries. Geological survey. Manganese ores South Africa. Geology South Africa Postmasburg. Geological Survey (South Africa) Postmasburg manganese deposits. 26738 26738