Columbia subject headings:
Art, Modern--20th century--History.
Artists' books.
Small presses--History.
Underground press publications--History.
Harvard subject headings:
Art publishing--Europe--History--20th century.
Artists' books--Europe--History--20th century.
Artists--Archives.
Princeton subject headings:
Art publishing--Europe--History--20th century.
Artists' books--Europe--History--20th century.
Artists--Archives.