- FondsAD3411 - South African Institute of Race Relations (SAIRR), Records
- SeriesA - Organisational Files
- SubseriesA1 - Frederick Johannes van Wyk
- ItemA1-2 - Correspondence
- PartA1-2-2 - Pastor Siegfried Groth
- PartA1-2-3 - Frank S. Loescher
- PartA1-2-4 - Correspondence concerning donations to the SAIRR in memory of Leo Marquard
- PartA1-2-5 - Letters between FJ van Wyk and Quintin Whyte