Columbia subject headings:
Love-letters--France.
Nietzsche, Friedrich Wilhelm, 1844-1900--Influence.
Painters--France--Correspondence.
Picabia, Francis, 1879-1953--Correspondence.
Romain, Suzanne--Correspondence.
Harvard subject headings:
Picabia, Francis, 1879-1953--Correspondence.
Romain, Suzanne--Correspondence.
Princeton subject headings:
Picabia, Francis, 1879-1953--Correspondence.
Romain, Suzanne--Correspondence.