- collectionAD1715 - South African Institute of Race Relations (SAIRR), Records
- Série organique5 - ADMINISTRATION OF AFRICANS
- Sous-série organique5.19 - Pass Laws: correspondence, memoranda and statements
- Dossier5.19.1 - The Pass Laws', typescript of article by Advocate E. Kahn, with corrections made by Dr. Hellmann
- PartiellementThe Pass Laws', typescript of article by Advocate E. Kahn, with corrections made by Dr. Hellmann 1
- PartiellementThe Pass Laws', typescript of article by Advocate E. Kahn, with corrections made by Dr. Hellmann 2