Columbia subject headings:
Libraries--Austria--Directories.
Library resources--Austria--Directories.
Harvard subject headings:
Historical libraries--Austria--Directories.
History--Library resources--Austria--Directories.
Libraries--Austria--Directories.
Library resources--Austria--Directories.
Princeton subject headings:
Directories.
Historical libraries--Austria--Directories.
History--Library resources--Austria--Directories.
Libraries--Austria--Directories.
Library resources--Austria--Directories.