Columbia subject headings:
Harvard subject headings:
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716--Archives.
Peter I, Emperor of Russia, 1672-1725--Travel--Europe, Western--Sources.
Russia--History--Peter I, 1689-1725--Sources.
Princeton subject headings:
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716--Archives.
Peter I, Emperor of Russia, 1672-1725--Travel--Europe, Western--Sources.
Russia--History--Peter I, 1689-1725--Sources.