Columbia subject headings:
Wood-engraving--20th century--Congresses.
Wood-engraving--21st century--Congresses.
Harvard subject headings:
Wood-engraving--20th century--Congresses.
Wood-engraving--21st century--Congresses.
Princeton subject headings:
Wood-engraving--20th century--Congresses.
Wood-engraving--21st century--Congresses.