Cardinals Radio Affiliates
Explaining the 'Mystery' of Numbers Stations
KCOR
The History of the Electric Telegraph and Telegraphy
How The First Spanish Radio Broadcast Made History for the Cardinals and Memories for the Molina Family, by Jill Falk
Radio y Televisión Martí - Wikipedia
Spanish Language Broadcast History National Museum of American History
Spanish Broadcasting System - Wikipedia
Official St. Louis Cardinals Website
Radio in the United States - Wikipedia
San Antonio Spanish-language broadcast pioneer founded radio, TV stations
History of broadcasting - Wikipedia
How Spanish-Language Radio Helped Radicalize A Generation Of Miami Abuelos
History of broadcasting - Wikipedia
Spanish-Language Radio Star Yanked Off The Air : Code Switch : NPR