Columbia subject headings:
Conversion--19th century.
Conversion--20th century.
Russia--Intellectual life--1801-1917.
Russia--Intellectual life--20th century.
Harvard subject headings:
Conversion--History--19th century--Congresses.
Conversion--History--20th century--Congresses.
Russia--Intellectual life--1801-1917--Congresses.
Russia--Intellectual life--20th century--Congresses.
Princeton subject headings:
Conversion--19th century.
Conversion--20th century.
Russia--Intellectual life--1801-1917.
Russia--Intellectual life--20th century.