Columbia subject headings:
Nordrhein-Westfälisches Hauptstaatsarchiv--Catalogs.
Schmitt, Carl, 1888-1985--Archives--Catalogs.
Schmitt, Carl, 1888-1985--Bibliography.
Schmitt, Carl, 1888-1985--Library--Catalogs.
Harvard subject headings:
Nordrhein-Westfälisches Hauptstaatsarchiv--Catalogs.
Schmitt, Carl, 1888-1985--Archives--Catalogs.
Schmitt, Carl, 1888-1985--Bibliography.
Schmitt, Carl, 1888-1985--Library--Catalogs.
Princeton subject headings:
Catalogs.
Nordrhein-Westfälisches Hauptstaatsarchiv--Catalogs.
Schmitt, Carl, 1888-1985--Archives--Catalogs.
Schmitt, Carl, 1888-1985--Bibliography.
Schmitt, Carl, 1888-1985--Library--Catalogs.