National Gallery of Art (U.S.) (Corporate Name)

Kokuritsu Bijutsukan, mappu to gairyaku annai, 1996?

Its Karta i putevoditelʹ, Nat︠s︡ionalʹnai︠a︡ kartinnai︠a︡ galerei︠a︡, Vashington, 2009.

Smithsonian year, 1969: page 623 (The National Gallery of Art, although technically established as a bureau of the Smithsonian Institution, is an autonomous and separately administered organization and is governed by its own Board of Trustees)

Wikipedia, April 19, 2023 (The National Gallery of Art, and its attached Sculpture Garden, is a national art museum in Washington, D.C., United States, located on the National Mall, between 3rd and 9th Streets, at Constitution Avenue NW. Open to the public and free of charge, the museum was privately established in 1937 for the American people by a joint resolution of the United States Congress) https://en.wikipedia.org/wiki/National_Gallery_of_Art

The National Gallery of Art was established in 1937 through the gift of Andrew W. Mellon, to the United States, of a collection of paintings and of a fund for housing and maintenance thereof.