Columbia subject headings:
Harvard subject headings:
Communication and traffic--Austria--History.
Communication and traffic--Germany--History.
Communication and traffic--Switzerland--Schaffhausen--History.
Postal service--Austria--History.
Postal service--Germany--History
Postal service--Switzerland--Schaffhausen--History.
Telecommunication--Austria--History.
Telecommunication--Germany--History.
Telecommunication--Switzerland--Schaffhausen--History.
Princeton subject headings:
Postal service--Switzerland--Schaffhausen--History.