Columbia subject headings:
Artists' preparatory studies--Exhibitions.
Landscape painting, German--Germany--Rhein-Main Region--Exhibitions.
Oil sketches--Exhibitions.
Rhein-Main Region (Germany)--In art--Exhibitions.
Harvard subject headings:
Artists' preparatory studies--Exhibitions.
Landscape painting, German--Germany--Rhein-Main Region--Exhibitions.
Oil sketches--Exhibitions.
Rhein-Main Region (Germany)--In art--Exhibitions.
Princeton subject headings:
Artists' preparatory studies--Exhibitions.
Landscape painting, German--Germany--Rhein-Main Region--Exhibitions.
Oil sketches--Exhibitions.
Rhein-Main Region (Germany)--In art--Exhibitions.