| Unidentified photographer/creator Letter from Michael P. Evans to Frederick Ebersold, Chicago 1887, 10 February (letter) Book page, Letter Google Books LL/35050 Published in "History of The Chicago Police from the Settlement to the Community of the Present Time" by John J. Flinn, assisted by John E. Wilkie (Chicago: under the Auspices of the Police Book Fund, 1887), p.455.
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