Columbia subject headings:
Harvard subject headings:
Information services--Congresses.
Information services--Germany--Congresses.
Libraries and scholars--Congresses.
Libraries and scholars--Germany--Congresses.
Library cooperation--Congresses.
Library materials--Digitization--Congresses.
Princeton subject headings:
Information services--Congresses.
Information services--Germany--Congresses.
Libraries and scholars--Congresses.
Libraries and scholars--Germany--Congresses.
Library cooperation--Congresses.
Library materials--Digitization--Congresses.