Columbia subject headings:
Avvakum Petrovich, Protopope, 1620 or 1621-1682.
Old Believers--History.
Harvard subject headings:
Avvakum Petrovich, Protopope, 1620 or 1621-1682
Old Believers--History.
Princeton subject headings:
Avvakum Petrovich, Protopope, 1620 or 1621-1682.
Old Believers--History.