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- [S25458533593] Complete Peerage, G E Cockayne et al, (St. Catherine Press, 29 Great Queen St, Kingsway, London 1910 on), Despenser art, Vol IV, p. 259 seq.
- [S25458533593] Complete Peerage, G E Cockayne et al, (St. Catherine Press, 29 Great Queen St, Kingsway, London 1910 on), Abergavenny art. Vol I, p. 24 seq.
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- [S50917195407] Reitwiesner, William Addams.
d. of Richard de Beauchamp Earl of Worcester (son of Wm de Beauchamp) & Isabel le Despenser
- [S50917195287] Plantagenet Ancestry of 17th Century Colonists, David Faris, (Genealogical Publishing County, Baltimore, MD, 1996), 1st ed, pp 210-213 "Oxenbridge".
- [S50917194911] Mann Database, Ed Mann.
- [S50917195407] Reitwiesner, William Addams.
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- [S25458533642] Plantagenet Ancestry of 17th C Colonists, 2nd ed., David Faris, (N E H G S), p.20.
- [S25458533593] Complete Peerage, G E Cockayne et al, (St. Catherine Press, 29 Great Queen St, Kingsway, London 1910 on), Burghersh art, Vol I, p. 425 seq.
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