Columbia subject headings:
Habsburg, House of.
Multilingual communication--Austria--History.
Postcards--Austria--History.
Harvard subject headings:
Habsburg, House of.
Multilingual communication--Austria--History.
Postcards in art
Postcards--Austria--History.
Postcards--Collectors and collecting--Austria.
Princeton subject headings:
Habsburg, House of.
Multilingual communication--Austria--History.
Postcards--Austria--History.