Columbia subject headings:
Graphic arts--Germany--20th century--Exhibitions.
Welle, Hans--Art collections--Exhibitions.
Welle, Uschi--Art collections--Exhibitions.
Harvard subject headings:
Graphic arts--Germany--20th century--Exhibitions.
Prints--20th century--Exhibitions
Prints--Germany--Berlin--Exhibitions.
Staatliche Museen Preussischer Kulturbesitz. Kupferstichkabinett--Exhibitions.
Welle, Hans--Art collections--Exhibitions.
Welle, Hans--Exhibitions.
Welle, Uschi--Art collections--Exhibitions.
Welle, Uschi--Exhibitions.
Princeton subject headings: