Iver O. Penttinen2020-04-082020-04-082020-04-08https://hdl.handle.net/10735.1/7897Sketch of a portrait of Hans Klein dressed in uniform wearing his decorations. Image displayed (72 dpi JPEG), Master image (600 dpi TIFF).George H. Williams, Jr. World War I Aviation LibraryWorld War, 1914-1918Air pilots, Military--Germany--Biography.Aeronautics Awards.Image4IOP-01-18-PB9