The Pretoria salt-pan a soda caldera Wagner, Percy Albert. creator text bibliography sa Pretoria The Government Printing and Stationery Office 1922 monographic eng
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136 p. XIX pl. (part fold.; incl. fold. col. map) tables. 25 cm. by Percy A. Wagner ... At head of title: Union of South Africa. Department of mines and industries. Bibliographical foot-notes. Geology, Economic South Africa Mines and mineral resources South Africa Salt mines and mining South Africa QE324 .A3 no. 20 South Africa. Geological Survey. Memoir no. 20 gs 23000005 Library, U.S. Geological Survey 860307 20260227111327.0 gs 23000005