I. J. Sanders, "English Baronies: A Study of Their Origin and Descent, 1086-1327...

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I. J. Sanders, "English Baronies: A Study of Their Origin and Descent, 1086-1327," Oxford: Clarendon Press, 1960. Cited by John P. Ravilious. Soc.genealogy.medieval. September 22, 2004. De Birkin Family , Accessed Feb 26, 2018. jhd

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