Columbia subject headings:
Painters--Russia--Correspondence.
Roerich, Nicholas, 1874-1947--Correspondence.
Harvard subject headings:
Painters--Russia (Federation)--Correspondence.
Roerich, Nicholas, 1874-1947. Correspondence
Princeton subject headings:
Painters--Russia (Federation)--Correspondence.
Roerich, Nicholas, 1874-1947. Correspondence.