Columbia subject headings:
Inventors--France--Correspondence.
Niépce, Nicéphore, 1765-1833--Correspondence.
Niépce, Nicéphore, 1765-1833.
Photographers--France--Correspondence.
Harvard subject headings:
Inventors--France--Correspondence.
Niépce, Nicéphore, 1765-1833--Correspondence.
Niépce, Nicéphore, 1765-1833.
Photographers--France--Correspondence.
Princeton subject headings: