Columbia subject headings:
Artists' marks--Dictionaries.
Artists--Autographs--Dictionaries.
Signatures--Dictionaries.
Harvard subject headings:
Art, Belgian--19th century.
Art, Belgian--20th century.
Artists' marks--Belgium--Dictionaries.
Artists--Belgium--Autographs--Dictionaries.
Monograms--Dictionaries.
Princeton subject headings:
Artists' marks--Dictionaries.
Artists--Autographs--Dictionaries.
Dictionaries.
Signatures--Dictionaries.