Columbia subject headings:
Authors, Russian--20th century--Correspondence.
Gippius, Z. N. (Zinaida Nikolaevna), 1869-1945--Correspondence.
Harvard subject headings:
Authors, Russian--20th century--Correspondence
Gippius, Z. N. (Zinaida Nikolaevna), 1869-1945.
Princeton subject headings:
Authors, Russian--20th century--Correspondence.
Gippius, Z. N. (Zinaida Nikolaevna), 1869-1945. Correspondence.