Columbia subject headings:
Etching--History.
Lithography--History.
Harvard subject headings:
Corot, Jean-Baptiste-Camille, 1796-1875.
Daubigny, Charles François, 1817-1878.
Etching--History.
Lithography--History.
Prints--History
Princeton subject headings:
Corot, Jean-Baptiste-Camille, 1796-1875.
Daubigny, Charles François, 1817-1878.
Etching--History.
Lithography--History.
Prints--History.