Technical Library
- R52 Owners handbook (German language) (published 1928) (6.5 MB)
- R52 Owners manual (German language) (published 1929) (3.8 MB)
- R52 Owners handbook (English language) (published 1929) (5.9 MB)
- R52 Owners handbook (German language) (published 1929) (8.7 MB)
- R52 Owners handbook (German language) (published 1931) (7.8 MB)