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- [S224] du Plooy.paf (Reliability: ).
- [S441] South African Genealogies Vol 01: A-C, J.A. Heese and R.T.J. Lombard, (SOUTH AFRICAN GENEALOGIES. Vol 1. A-CHeese, J A & R T J Lombard Pretoria, Human Sciences Research Council. 1986.), p211 (Reliability: 3 ).
- [S100] Richard Ford.ged (Reliability: ).
- [S238] Ahlers, JR databasis, Ahlers, JR (Reliability: ).
- [S617] South Africa.ged (Reliability: ).
- [S479] Stamboom 7 Junie 2008.paf (Reliability: ).
- [S439] Ahlers databasis, Ahlers, Johann Robert, (Onlangse inligting saamgestel uit inligting vanaf familielede; verdere oorspronklike navorsing in argiewe (eie en betaalde navorsing); gepubliseerde bronne soos SAG en BAIE geraadpleegde werke en individuele kontak - vir volledige lys sien http://johann.ahlers.googlepages.com/erkenning) (Reliability: ).
- [S303] Ahlers-Venter-LeRoux-Hofmeyer.fdb, Johann Ahlers (Reliability: ).
- [S181] FAMILIA Vol 14, no. 4 1977, Dr. J.A. Heese, Familia Vol. 14, no. 4 1977 bladsy 72 en 73 (Reliability: 3 ).
- [S362] SAG, Heese, J A en Lombard, R T J, (Pretoria. Raad vir Geesteswetenskaplike Navorsing. Later GISA.), Vol 1 p211 (Reliability: 3 ).
- [S71] Suid-Afrikaanse Geslagregisters, Heese, J A en Lombard, R T J, (Pretoria. Raad vir Geesteswetenskaplike Navorsing. Later GISA.), Vol 1 p211 (Reliability: 3 ).
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