Columbia subject headings:
Piper, John, 1903-1992--Catalogs.
Prints, British--Catalogs.
Prints--England--20th century--Catalogs.
Harvard subject headings:
Piper, John, 1903---Catalogues raisonnés.
Prints, British--Catalogues raisonnés.
Prints--England--20th century--Catalogues raisonnés.
Princeton subject headings: