Three hardcover WWII Luftwaffe reference books by Karl Ries. Color plates, b&w photos and drawings. German language
- Markings and Camouflage Systems of Luftwaffe Aircraft in World War II, Vol. 1. 110 pages. 1966
- Markings and Camouflage Systems of Luftwaffe Aircraft in World War II, Vol. 2. 112 pages. 1965
- Dora-Kurfürst und rote 13. Picture book of Luftwaffe Aircraft 1933-1945. 192 pages. 1966