Columbia subject headings:
Authors, French--20th century--Correspondence.
Péguy, Charles, 1873-1914--Correspondence.
Harvard subject headings:
Authors, French--20th century--Correspondence
Péguy, Charles, 1873-1914--Correspondence.
Princeton subject headings:
Authors, French--20th century--Correspondence.
Péguy, Charles, 1873-1914.