01144cam a22002411 4500 gs 22000386 DLC 20260227111326.0 860307m19221928sa abf f000 0 eng c gs 22000386 (OCoLC)13253560 Library, U.S. Geological Survey NhD NhD OCoLC DLC premarc QE324 .A3 Wybergh, Wilfrid John, 1868- The coal resources of the Union of South Africa ... Pretoria, The Government Printing and Stationery Office, 1922-28. 3 v. illus., fold. plates (incl. maps, profiles) tables, diagrs. 25 cm. South Africa. Geological Survey. Memoir no. 19, vol. I-III At head of title: Union of South Africa. Dept. of mines and industries. v. 1. The coal fields of Wilbank, Springs and Heidelberg, and of the Orange Free State. 1922.--v. 2. The inland coal fields of Natal. 1925.--v. 3. The coal fields of the eastern and south-eastern Transvaal, Springbok flats, Waterberg, Zoutpansberg and of the Cape Province. 1928. Coal South Africa. 26193 26193