Cornell Chronicle - "Sixto Gonzalez named first Puerto Rico-born head of Arecibo Observatory" (David Brand), 9/25/03, Box: 54, Folder: 320. Arecibo Ionospheric Observatory records, 53-7-3581. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/284970 Accessed April 08, 2026.