Columbia subject headings:
Harvard subject headings:
Artists--Germany--History--Exhibitions.
Authors, German--18th century--Exhibitions.
Authors, German--19th century--Exhibitions.
Authors, German--Pictorial works--Exhibitions.
Klenner-Otto, Stephan--Exhibitions.
Princeton subject headings:
Authors--Portraits--Exhibitions.
Klenner-Otto, Stephan--Exhibitions.
Portrait drawing, German--Exhibitions.
Portraits.