This collection contains five black paper photo albums kept by Henry and Carl Thiessen, RPI Class of 1909 and Class of 1913, respectively. The photos showcase civil engineering projects, as well as travel photographs from Trinidad; East St. Louis, Illinois; Canton and Chagrin Falls, Ohio; Loch Raven, Maryland; Oilton, Oklahoma; and Lake Linden, Michigan. Also included are snapshots of Henry, Carl, and co-workers, as well as photos taken on a trip to Washington, DC.