by South African Association of Engineers

1908

by Geological Society of South Africa

1915

by South African Association for the Advancement of Science

1909

by South Africa. Department of Mines and Industries

1924

by South Africa. Office of Census and Statistics

1918

by South African Institute of Mining and Metallurgy

1905

by South Africa. Office of Census and Statistics

1919

by South Wales Institute of Engineers

1915

by South African National Union

1924

by South African Institution of Mechanical Engineers

1912

by Geological Society of South Africa

1905

by South African Institution of Engineers

1908