Columbia subject headings:
Postal service--Mexico--Guadalajara--History.
Telegraph--Mexico--Guadalajara--History.
Telephone--Mexico--Guadalajara--History.
Harvard subject headings:
Postal service--Mexico--Guadalajara--History.
Telegraph--Mexico--Guadalajara--History.
Telephone--Mexico--Guadalajara--History.
Princeton subject headings:
Postal service--Mexico--Guadalajara--History.
Telecommunication--Mexico--Guadalajara--History.
Telegraph--Mexico--Guadalajara--History.
Telephone--Mexico--Guadalajara--History.