Columbia subject headings:
Harvard subject headings:
Caspar, Karl, 1879-1956--Exhibitions.
Caspar-Filser, Maria, 1878-1968--Exhibitions.
National socialism and art--Exhibitions.
Princeton subject headings:
Caspar, Karl, 1879-1956--Exhibitions.
Caspar-Filser, Maria, 1878-1968--Exhibitions.