"Calmar & Chamb W.D. R.P.O. Jun 12, 1888 postmark in black with light cork killer on 2c brown banknote stamp. The Calmar (Iowa) to Chamberlain line of the Milwaukee system ran for 399 miles. The ""W.D."" denotes the ""Western Division"" of the route. Sanborn House, Mitchell, Dak corner card noting 'Bus to and from all Trains."
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