Columbia subject headings:
Tchaikovsky, Peter Ilich, 1840-1893--Correspondence.
Tchaikovsky, Peter Ilich, 1840-1893--Marriage.
Harvard subject headings:
Tchaikovsky, Peter Ilich, 1840-1893--Correspondence.
Tchaikovsky, Peter Ilich, 1840-1893--Marriage.
Princeton subject headings:
Tchaikovsky, Peter Ilich, 1840-1893--Correspondence.
Tchaikovsky, Peter Ilich, 1840-1893--Marriage.