Columbia subject headings:
Rhineland (Germany)--Intellectual life--19th century--Sources--Bibliography--Catalogs.
Rhineland (Germany)--Intellectual life--20th century--Sources--Bibliography--Catalogs.
Harvard subject headings:
Rhineland (Germany)--Intellectual life--19th century--Sources--Bibliography--Catalogs.
Rhineland (Germany)--Intellectual life--20th century--Sources--Bibliography--Catalogs.
Princeton subject headings:
Catalogs.
Rhineland (Germany)--Intellectual life--19th century--Sources--Bibliography--Catalogs.
Rhineland (Germany)--Intellectual life--20th century--Sources--Bibliography--Catalogs.