Have you made your research trip to La Crosse yet? I travelled there in July 2002, finding quite a lot of information on my ggf John M Kohn, my gg uncle Mathias Kohn and his descendants. I would like to share this and your information about the Helen KOHN=George JOHNSON family.
Thank you for the corrected dates in the Mathias KOHN family. One of the names you gave, Joseph (1886-1886) is not in this family, but in the family of John M KOHN. Joseph's mother, Susanna (1848-1887), is also buried in Catholic Cemetery, beside Joseph.
My current quest is to find information about Michael KOHN, a brother to John M and Mathias, who was born 19 Jul 1844 in Wasserliesch Germany, emigrated from Germany in 1871 or 1872, and who naturalized in La Crosse in 1872. He may have lived there through at least 1876, working as a cabinet maker.