Keywords: Lot-11952-VI-9: Diagram for a spherical balloon, 1920. Ernest La Rue Collection, Gift of the U.S. Army. Courtesy of the Library of Congress. (2016/09/16). Lot-11952-VI-9: Diagram for a spherical balloon, 1920. Ernest La Rue Collection, Gift of the U.S. Army. Courtesy of the Library of Congress. (2016/09/16). |