Columbia subject headings:
Art--Collectors and collecting--Netherlands--Correspondence.
Artists--France--Correspondence.
Bonger, Andries, 1861-1936--Correspondence.
Europe--Intellectual life--19th century.
Europe--Intellectual life--20th century.
Redon, Odilon, 1840-1916--Correspondence.
Harvard subject headings:
Princeton subject headings:
Artists--France--Correspondence.
Painters--France--Correspondence.
Redon, Odilon, 1840-1916--Correspondence.