- Research notes by Elaine Berk, 2002, courtesy of Lynn Bjorkman.
- Vertical Files, Morristown Public Library.
- Tom Carlson, Term Paper, 21 February 1997, Box 3 Folder 23, MTU Archives.
- Todd to Samuel B. Harris, 12 July 1895, Acc. No. 001, Box 338, folder 9, MTU Archives.
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