Columbia subject headings:
Harvard subject headings:
Artists--Netherlands--Correspondence.
Mondrian, Piet, 1872-1944--Aesthetics.
Mondrian, Piet, 1872-1944--Correspondence.
Mondrian, Piet, 1872-1944--Views on art.
Neoplasticism.
Princeton subject headings:
Artists--Netherlands--Correspondence.
Mondrian, Piet, 1872-1944--Correspondence.
Neoplasticism.