Studies of tolerances, point feeding and cluster feeding of the Gregorian dual-reflector feed for the Arecibo radio telescope, 4/92, Box: 46, Folder: 19. Arecibo Ionospheric Observatory records, 53-7-3581. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/285632 Accessed April 11, 2026.