Columbia subject headings:
Fox, Gustavus Vasa, 1821-1883.
Soviet Union--Description and travel.
Soviet Union--Foreign relations--United States.
United States--Foreign relations--Soviet Union.
Harvard subject headings:
Fox, Gustavus Vasa, 1821-1883
Fox, Gustavus Vasa, 1821-1883--Travel--Russia.
Russia--Description and travel.
Russia--Foreign relations--United States.
Soviet Union--Description and travel.
Soviet Union--Foreign relations--United States.
United States--Foreign relations--Russia.
United States--Foreign relations--Soviet Union.
Princeton subject headings:
Fox, Gustavus Vasa, 1821-1883.
Russia--Description and travel.
Russia--Foreign relations--United States.
United States--Foreign relations--Russia.