Columbia subject headings:
Harvard subject headings:
Annenskiĭ, Innokentiĭ, 1855-1909--Criticism and interpretation.
Babelʹ, I. (Isaak), 1894-1940--Criticism and interpretation.
Kuzmin, M. A. (Mikhail Alekseevich), 1872-1936--Criticism and interpretation.
Opera--Europe--19th century.
Opera--Europe--20th century.
Opera--Russia (Federation)--20th century.
Princeton subject headings:
Annenskiĭ, Innokentiĭ, 1855-1909--Criticism and interpretation.
Babelʹ, I. (Isaak), 1894-1940--Criticism and interpretation.
Kuzmin, M. A. (Mikhail Alekseevich), 1872-1936--Criticism and interpretation.
Opera--Europe--19th century.
Opera--Europe--20th century.
Opera--Russia (Federation)--20th century.