Columbia subject headings:
Harvard subject headings:
Drawing, German--Catalogs
Drawing--Netherlands--Catalogs.
Engraving, German--Catalogs.
Engraving--Netherlands--Catalogs.
Kobell family--Catalogs.
Stadtmuseum Ludwigshafen am Rhein--Catalogs.
Princeton subject headings:
Art--Germany (West)--Ludwigshafen am Rhein--Catalogs.
Kobell family--Catalogs.
Stadtmuseum Ludwigshafen am Rhein--Catalogs.