Columbia subject headings:
Libraries--Austria--Special collections--Congresses.
Libraries--Germany--Special collections--Congresses.
Manuscripts--Digitization--Austria--Congresses.
Manuscripts--Digitization--Germany--Congresses.
Rare books--Digitization--Austria--Congresses.
Rare books--Digitization--Germany--Congresses.
Zotter, Hans.
Harvard subject headings:
Academic libraries--Austria--Congresses.
Academic libraries--Germany--Congresses.
Libraries--Special collections--Congresses.
Library materials--Austria--Congresses.
Library materials--Germany--Congresses.
Universitätsbibliothek Graz--Congresses.
Zotter, Hans--Congresses.
Princeton subject headings: