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- [S300] Josephine C. Frost, Ancestors of James Wickham and his wife Cora Prudence Billard. Includes bibliographical references and index. (Unknown publisher. 1935. 207 p), p. 148.
- [S183] Rev. Jacob E. Mallmann, Historical papers on Shelter Island and its Presbyterian church, with genealogical tables ... /, p. 166.
- [S308] Family data, Ketcham Family Bible, Holy Bible with Apocrypha, (: Printed by John Adams and William Hancock for Mathew Carey, 122 Market St., Philadelphia, 7 November 1803); in possession of a descendent of Scudder Ketcham. Photocopy of relevant pa.
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