References for Thomas 4th Duke, 15th Earl Howard * of Norfolk * of Surrey

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Akten GrR2. Bayerisches Hauptstaatsarchiv, Adelsmatrikel
Sir B.Burke: A Genealogical History of the Peerages and Knightages of the British Empire. London, 1953
Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
Gothaischer genealogischer Hofkalender auf das Jahr 1909. J.Perthes, Gotha, 1908