Columbia subject headings:
Harvard subject headings:
Composers--Russia--Correspondence
Rimsky-Korsakov, Nikolay, 1844-1908--Correspondence.
Zabela-Vrubelʹ, Nadezhda Ivanovna, 1868-1913--Correspondence.
Princeton subject headings:
Composers--Russia--Correspondence.
Rimsky-Korsakov, Nikolay, 1844-1908--Correspondence.
Women singers--Russia--Correspondence.
Zabela-Vrubelʹ, Nadezhda Ivanovna, 1868-1913--Correspondence.