Folder 41: Offprints by Hagen, J.G.,, 1925 - 1952

Folder 41: Offprints by Hagen, J.G.,, 1925 - 1952, Box: 6, Folder: 41. Georgetown Observatory Collection, GRB-000010. Georgetown University Rare Books , Booth Family Center for Special Collections. https://findingaids.library.georgetown.edu/repositories/14/archival_objects/1163475 Accessed December 07, 2025.