URL: https://digitalcollections.hoover.org/objects/37980 Collection Structure Poster collection > America's great achievement - a virgin forest converted into a military city for 40,000 men in 52 days ... Item Title America's great achievement - a virgin forest converted into a military city for 40,000 men in 52 days ... Collection Title Poster collection Date Created 1917/1918? Description Text only. Subject(s) Military bases World War, 1914-1918 United States Economic aspects Construction industry Language(s) English Country of Origin United States Country of Origin United States Dimensions Overall: 5 x 14 in. (12.7 x 35.6 cm) Format Poster Medium political posters Color color Color color Hoover ID Poster US 4680 Record Number XX343.28356 Collection Guide https://oac.cdlib.org/findaid/ark:/13030/kt829015km Rights No known restrictions.