Columbia subject headings:
Libraries--Germany--History.
Museums--Germany--History.
National libraries--Germany.
Stiftung Preussischer Kulturbesitz.
Harvard subject headings:
Archival materials--Conservation and restoration--Germany--History--21st century.
Art--Conservation and restoration--Germany.
Cultural property--Protection--Germany.
Library materials--Conservation and restoration--Germany--History--21st century.
Museums--Collection management--History--21st century.
Princeton subject headings: