Wilson, Douglas L., ed.; Davis, Rodney O., ed.; Speed, Joshua F. 'Joshua F. Speed to William H. Herndon' in 'Herndon's Informants: Letters, Interviews, and Statements About Abraham Lincoln' . Urbana: University of Illinois Press, 1998. [format: book], [genre: letter]. Permission: University of Illinois Press
Persistent link to this document: http://lincoln.lib.niu.edu/file.php?file=herndon430.html

Note from page 430: 1. As Springer was probably not transcribing new material at this date and no such copies are known, it is unclear which letters Speed copied and sent to William H. Herndon.