by South African Institute of Mining and Metallurgy

1905

by Chemical, Metallurgical and Mining Society of South Africa, Johannesburg

1922

by South African Association for the Advancement of Science

1922

by South Africa. Office of Census and Statistics

1918

by South Africa. Office of Census and Statistics

1918

by South Africa. Department of Mines and Industries

1924

by Chemical, Metallurgical, and Mining Society of South Africa

1903

by Chemical, Metallurgical, and Mining Society of South Africa

1909

by South African Institution of Engineers

1903

by South African Institution of Engineers

1908

by South African Chemical Institute

1928

by South African Institute of Mining and Metallurgy

1903