There is a Clemens Knaus who md. Eliza Greub 17 Nov 1874 in Denver, Colorado, listed in the IGI on www.familysearch.org/ Their children are also there. Do you have anything on the descendents of their son, Clemens Edward Knaus, b. 1884, Niwot, Boulder, Colorado and Kathleen Ethel Green, b. 1885, Ringgold Co., Iowa, daughter of Ephraim Stout Green and Louisa Lucretia Brown?