Columbia subject headings:
Harvard subject headings:
Descartes, René, 1596-1650--Correspondence.
Descartes, René, 1596-1650.
Philosophy, Modern--17th century.
Princeton subject headings:
Descartes, René, 1596-1650--Correspondence.
Descartes, René, 1596-1650.
Personal correspondence.
Philosophy, Modern--17th century.