Columbia subject headings:
Harvard subject headings:
Baotou Shi (China)--History.
Postal service--China--Baotou Shi--History.
Telecommunication--China--Baotou Shi--History.
Princeton subject headings:
Baotou Shi (China)--History.
Postal service--China--Baotou Shi--History.
Telecommunication--China--Baotou Shi--History.