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- [S25458533593] Complete Peerage, G E Cockayne et al, (St. Catherine Press, 29 Great Queen St, Kingsway, London 1910 on), Engaine article, Vol V, pp. 76-7.
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- [S25458533684] Tim Powys-Lybbe.
- [S25458533682] ODNB: Dictionary of National Biography, 2nd edition, Various, (OUP 2004), His brother, Walter Langton"s article.
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