Columbia subject headings:
Apollinaire, Guillaume, 1880-1918--Correspondence.
Apollinaire, Guillaume, 1880-1918--Family.
Poets, French--20th century--Correspondence.
Harvard subject headings:
Apollinaire, Guillaume, 1880-1918. Correspondence
Kostrowitzky, Albert de--Correspondence.
Kostrowitzky, Olga de--Correspondence.
Poets, French--20th century--Correspondence
Princeton subject headings:
Apollinaire, Guillaume, 1880-1918. Correspondence.
Poets, French--20th century--Correspondence.