- FondsA1138 - James Charles Napoleon Humphreys, Mining papers
- SeriesO - Potgietersrust District
- File510 - Potgieters Rust District
- File511 - Geology Northern Transvaal - Holmes
- File512 - Norits and Granites of Central Transvaal - Kynaston
- File513 - Dolomite at M. Lime Works - P.P. Rust-Young
- File514 - Calcareous Beds - Potgietersrust - A.L. Hall
- 2 more...