Columbia subject headings:
Engraving--History.
Etching--History.
Lithography--History.
Photomechanical processes.
Wood-engraving--History.
Harvard subject headings:
Engraving--History.
Etching--History.
Lithography--History.
Photomechanical processes.
Wood-engraving--History.
Princeton subject headings:
Engraving--History.
Etching--History.
Lithography--History.
Photomechanical processes.
Wood-engraving--History.