References for Ranulph Earl, Vicomte de Gernon * of Chester * d'Avranches

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E. Brandenburg: Die Nachkommen Karls des Grossen. Leipzig 1936, Frankfurt 1964
F.M.Powicke, E.B.Fryde: Handbook of British Chronology. London, 1961
F.L.Weis: Ancestral Roots of Sixty Colonists. 6th Ed., Baltimore, 1988