Columbia subject headings:
Authors, French--18th century--Correspondence.
Catherine II, Empress of Russia, 1729-1796--Correspondence.
Empresses--Russia--Correspondence.
Voltaire, 1694-1778--Correspondence.
Harvard subject headings:
Authors, French--18th century--Correspondence
Catherine II, Empress of Russia, 1729-1796--Correspondence.
Empresses--Russia--Correspondence.
Philosophers--France--Correspondence
Russia--Kings and rulers--Correspondence.
Voltaire, 1694-1778. Correspondence.
Princeton subject headings:
Authors, French--18th century--Correspondence.
Catherine II, Empress of Russia, 1729-1796--Correspondence.
Empresses--Russia--Correspondence.
Voltaire, 1694-1778. Correspondence.