01103cam a22002651 4500 gs 40000174 DLC 20260227111345.0 810504s1938 sa ab f000 0 eng c gs 40000174 (OCoLC)7389048 U.S. Geol. Survey. Library ViBlbV ViBlbV DLC premarc QE325 .A53 no. 11 Schwellnus, C. M. (Carl Martin), 1911- Vermiculite deposits in the Palaboroa area, N. E. Transvaal, by C. M. Schwellnus ... Publication of the Geological Survey Division. Pretoria, The Government Printer, 1938. 27 p. incl. illus. (maps) tables, diagrs. 24 cm. South Africa. Geological Survey. Geological series. Bulletin no. 11 At head of title: ... Union of South Africa. Department of Mines. Bibliographical foot-notes. Vermiculite. Mines and mineral resources South Africa Transvaal. Geological series. Bulletin (South Africa. Geological Survey Division) ; no. 11. 27632 27632