While poking around Google Books, I stumbled on the following two
references that might be of interest to this list.  The first is cited
by Kahn.

\emph{The Military Telegraph During the Civil War in the United States:
With an Exposition of Ancient and Modern Means of Communication,
and of the Federal and Confederate Cipher Systems ; Also a Running
Account of the War Between the States}
By William Rattle Plum
Published by Jansen, McClurg & Company, 1882

"Secret Writing"
The Century
Published by The Century Co., 1913

                --Steve Bellovin, http://www.cs.columbia.edu/~smb

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