Columbia subject headings:
Authors, French--20th century--Correspondence.
Parain, Brice, 1897-1971--Correspondence.
Perros, Georges--Correspondence.
Philosophers--France--Correspondence.
Harvard subject headings:
Authors, French--20th century--Correspondence
Parain, Brice, 1897-1971--Correspondence.
Perros, Georges--Correspondence.
Princeton subject headings:
Authors, French--20th century--Correspondence.
Parain, Brice, 1897-1971--Correspondence.
Perros, Georges--Correspondence.