Columbia subject headings:
Drawing, American--Washington (D.C.)--Exhibitions.
Drawing, European--Exhibitions.
Hammer, Armand, 1898-1990--Art collections--Exhibitions.
National Gallery of Art (U.S.)--Exhibitions.
Harvard subject headings:
Drawing, European--Exhibitions.
Drawing--Washington (D.C.)--Exhibitions.
Hammer, Armand, 1898-1990--Art collections--Exhibitions.
National Gallery of Art (U.S.)--Exhibitions.
Princeton subject headings:
Drawing, European--Exhibitions.
Drawing--Washington (D.C.)--Exhibitions.
Hammer, Armand, 1897---Art collections--Exhibitions.
National Gallery of Art (U.S.)--Exhibitions.