Columbia subject headings:
Gapon, Georgiĭ Apollonovich, 1870-1906.
Russia--History--Revolution, 1905-1907.
Working class--Russia--Biography.
Harvard subject headings:
Gapon, Georgiĭ Apollonovich, 1870-1906
Informers--Russia--Biography.
Priests--Russia--Biography.
Russia--History--Revolution, 1905-1907.
Working class--Russia--Biography.
Princeton subject headings:
Gapon, Georgiĭ Apollonovich, 1870-1906.
Informers--Russia--Biography.
Priests--Russia--Biography.
Russia--History--Revolution, 1905-1907.