Columbia subject headings:
Incunabula--Bibliography--Catalogs.
Libraries--Germany--Frankfurt am Main.
Harvard subject headings:
Incunabula--Germany--Frankfurt am Main--Bibliography--Catalogs.
Incunabula--Germany--Frankfurt am Main--Catalogs.
Libraries--Germany--Frankfurt am Main.
Stadt- und Universitätsbibliothek Frankfurt am Main--Catalogs.
Princeton subject headings:
Incunabula--Bibliography--Catalogs.
Libraries--Germany--Frankfurt am Main.