Folder 45: Offprints by Heyden, Francis J.,, 1950 - 1965

Folder 45: Offprints by Heyden, Francis J.,, 1950 - 1965, Box: 6, Folder: 45. Georgetown Observatory Collection, GRB-000010. Georgetown University Rare Books , Booth Family Center for Special Collections. https://findingaids.library.georgetown.edu/repositories/14/archival_objects/1163489 Accessed December 07, 2025.