Columbia subject headings:
Authors, French--20th century--Correspondence.
Butor, Michel--Correspondence.
Perros, Georges--Correspondence.
Harvard subject headings:
Authors, French--20th century--Correspondence
Butor, Michel--Correspondence.
Perros, Georges--Correspondence.
Princeton subject headings:
Authors, French--20th century--Correspondence.
Butor, Michel--Correspondence.
Perros, Georges--Correspondence.