Abbreviations
- BBAW
- Berlin Brandenburg Academy of Sciences
- FB Gotha
- Research Library Gotha
- NL
- Estate, Papers
- RGS
- Royal Geographical Society
- rt
- Imperial Dollar
- Stabi Berlin
- State Library Berlin
- Stabi HH
- State and University Library Hamburg
- StA HH
- State Archives Hamburg
- UB
- University Library