Columbia subject headings:
Authors, French--18th century--Correspondence.
Enlightenment.
Frederick II, King of Prussia, 1712-1786--Correspondence.
Philosophers--France--Correspondence.
Prussia (Germany)--Kings and rulers--Correspondence.
Voltaire, 1694-1778--Correspondence.
Harvard subject headings:
Authors, French--18th century--Correspondence
Enlightenment.
Frederick II, King of Prussia, 1712-1786--Correspondence.
Philosophers--France--Correspondence
Prussia (Germany)--Kings and rulers--Correspondence.
Voltaire, 1694-1778. Correspondence
Princeton subject headings:
Authors, French--18th century--Correspondence.
Enlightenment.
Frederick II, King of Prussia, 1712-1786--Correspondence.
Philosophers--France--Correspondence.
Prussia (Germany)--Kings and rulers--Correspondence.
Voltaire, 1694-1778. Correspondence.