Columbia subject headings:
Andrade, Edna, 1917---Exhibitions.
Optical art--Exhibitions.
Harvard subject headings:
Andrade, Edna, 1917---Exhibitions.
Art, Modern--20th century--Pennsylvania--Philadelphia--Exhibitions.
Optical art--Exhibitions.
Optical art--Pennsylvania--Philadelphia--Exhibitions.
Princeton subject headings:
Andrade, Edna, 1917---Exhibitions.
Optical art--Exhibitions.