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- [S2559] Ahlers, JR databasis, Ahlers, JR (Reliability: ).
- [S3868] 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: ).
- [S2926] Ahlers-Venter-LeRoux-Hofmeyer.fdb, Johann Ahlers (Reliability: ).
- [S3900] South African Genealogies Vol 05: L-M, GISA, (GISA), p 19 (Reliability: 3 ).
- [S3900] South African Genealogies Vol 05: L-M, GISA, (GISA), p 238 (Reliability: 3 ).
- [S501] De Villiers/Pama, C.C. de Villiers Revised and expanded by C. Pama, p496 This gives 14.1.1731 (Reliability: 3 ).
- [S586] South African Genealogies Vol 02: D-G, J.A. Heese and R.T.J. Lombard, (Pretoria, Human Sciences Research Council. 1989.), p296 (Reliability: 3 ).
- [S3900] South African Genealogies Vol 05: L-M, GISA, (GISA), p234 (Reliability: 3 ).
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