Collection consists of 143 photographs, 19 postcards, and related materials compiled by Horace Getz and Robert A. Johnson, both of Klamath Falls, Oregon. The materials document their service in the 20th Engineers Regiment Forestry Unit of the United States Army during World War I, from 1917 to 1919. The Forestry Unit established logging camps in France to produce timber for the construction of barracks and other structures during the war.