Useful links
- Historical Archives of the University of Bologna
- Archives of the Bologna University Library
- Archives of the Bologna Archiginnasio Public Library
- State Archives in Bologna
- Historical Archives of the Bologna Municipality
- Historical Archives of the Astronomical Observatories of the National Institute for Astrophysics (INAF)
- The “Specola 2000” project for Italian Astronomical Archives
- Galileo project
- Domus mazziniana (correspondence between Guido Horn d'Arturo and Raffaele Foa Vita)
- Princeton University Library (correspondence between Guido Horn d'Arturo and Henry Norris Russell)
- Fondo Angelo Secchi in Reggio Emilia
- Links to documents of G.D. Cassini
- Links to documents of P.M. Salvago
- Directory of International Archival Resources
- International Catalog of sources for the history of physics and allied sciences
- Armagh Observatory Archives
- Royal Observatory Edinburgh