Cite

del Rio y Cañedo, Francisco. "[Letter from Dr. Francisco del Rio y Cañedo to John J. Herrera - 1951-09-19]." University of North Texas. Libraries. 1951-09-19, https://texashistory.unt.edu/ark:/67531/metapth250200/.

del Rio y Cañedo, Francisco (1951-09-19). [Letter from Dr. Francisco del Rio y Cañedo to John J. Herrera - 1951-09-19]. Retrieved from https://texashistory.unt.edu/ark:/67531/metapth250200/

del Rio y Cañedo, Francisco. "[Letter from Dr. Francisco del Rio y Cañedo to John J. Herrera - 1951-09-19]." 1951-09-19. July 29, 2025. https://texashistory.unt.edu/ark:/67531/metapth250200/.