I got a bit carried away in researching the history of this
Twain-related landmark, but for those interested, here is a rewrite of
my entry on this location in "Twain's Geography". The early days - up
to and including the Civil War drew the interest of some eminent authors
of those times. https://twainsgeography.com/location/cairo-il
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/Unaffiliated Geographer and Twain aficionado/