Loud and Clear. San Antonio, Texas: Texas Association of Airport Executives, June 1, 1961

Loud and Clear. San Antonio, Texas: Texas Association of Airport Executives, June 1, 1961, Volume: Gilbert D588. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/526563 Accessed December 27, 2025.