"1907/1956" . "E. C. Kropp Company was a postcard printing and publishing company that operated in Milwaukee, Wisconsin, from 1907-1956. Pictured in the UA Ref 3, University of Oregon Libraries, Special Collections and Archives photographs, 1890s-2010s collection."@en . "E. C. Kropp Company"@en . "2017-12-19"^^ . "2017-12-19"^^ . . .