Columbia subject headings:
Engravers' marks.
Engravers.
Engraving--Bibliography.
Engraving--Collectors and collecting.
Engraving--Prices.
Harvard subject headings:
Princeton subject headings:
Engravers' marks.
Engravers.
Engraving--Bibliography.
Engraving--Collectors and collecting.
Engraving--Prices.