Columbia subject headings:
Harvard subject headings:
Artists--Autographs--Exhibitions.
Artists--Correspondence--Exhibitions.
Artists--France--Autographs--Exhibitions.
Artists--France--Correspondence--Exhibitions.
Artists--Germany--Autographs--Exhibitions.
Artists--Germany--Correspondence--Exhibitions.
Princeton subject headings:
Artists--Autographs--Exhibitions.
Artists--Correspondence--Exhibitions.