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- [S447] Engelbrecht Geslagsregister, Louis Engelbrecht, p 6 (Reliability: 3 ).
- [S360] Erasmussa.ged (Reliability: ).
- [S238] Ahlers, JR databasis, Ahlers, JR (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: ).
- [S479] Stamboom 7 Junie 2008.paf (Reliability: ).
- [S608] South African Genealogies Vol 02: D-G, J.A. Heese and R.T.J. Lombard, (Pretoria, Human Sciences Research Council. 1989.), p 215 (Reliability: 3 ).
- [S364] Erasmussa Gespreksgroep, (http://groups.yahoo.com/group/erasmus-sa/), Cynthia McFerran, 24 May 2004 (Reliability: 3 ).
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