Columbia subject headings:
Authors, French--20th century--Correspondence.
Martin Du Gard, Roger, 1881-1958--Correspondence.
Harvard subject headings:
Authors, French--20th century--Correspondence
Martin Du Gard, Roger, 1881-1958. Correspondence.
Princeton subject headings:
Authors, French--20th century--Correspondence.
Martin Du Gard, Roger, 1881-1958. Correspondence.