Iver O. Penttinen2020-04-142020-04-142020-04-09https://hdl.handle.net/10735.1/7936Portrait of William Coppens standing in front of an airplane, image is signed by Coppens. Image displayed (72 dpi JPEG), Master image (600 dpi TIFF).George H. Williams, Jr. World War I Aviation LibraryWorld War, 1914-1918World War, 1914-1918 Aerial operationsAir pilots, Military--United States--Biography.Military uniformsImage4IP-PB1