Columbia subject headings:
Harvard subject headings:
Heaney, Seamus, 1939-2013--Friends and associates.
Optical art--United States--Exhibitions.
Pearson, Henry, 1914-2006--Exhibitions.
Pearson, Henry, 1914-2006--Friends and associates.
Princeton subject headings:
Pearson, Henry, 1914-2006--Exhibitions.