Columbia subject headings:
Harvard subject headings:
Prussia (Germany)--Foreign relations--Russia--Sources.
Prussia (Germany)--Politics and government--1640-1740--Sources.
Russia--Foreign relations--Germany--Prussia--Sources.
Russia--Politics and government--1613-1689--Sources.
Princeton subject headings:
Prussia (Germany)--Politics and government--1640-1740.
Prussia (Germany)--Relations--Russia.
Russia--Relations--Germany--Prussia.