New York City, United States

Correspondence from Anne d'Harnoncourt, Curator of 20th Century Art for the Philadelphia Museum of Art, and Kynaston McShine, Curator for the Museum of Modern Art, to Robert Lebel.

Correspondence from Jane Necol, Curatorial Assistant for the Museum of Modern Art, to Anne d'Harnoncourt, Curator of 20th Century Art for the Philadelphia Museum of Art.

Correspondence from Joseph Solomon to Anne d'Harnoncourt, Curator of 20th Century Art at the Philadelphia Museum of Art.

Correspondence from Milo Lazarevic to Anne d'Harnoncourt, Curator of 20th Century Art at the Philadelphia Museum of Art. Includes slide of artwork by Lazarevic.

Installation view of "Lazy Hardware," Gotham Book Mart. New York, New York. Photo by Maya Deren. Copy print made by the Philadelphia Museum of Art. Another version is in the Alexina and Marcel Duchamp Papers at the Philadelphia Museum of Art.

Installation view of "Lazy Hardware," Gotham Book Mart with Marcel Duchamp and André Breton's reflection in the window. New York, New York. Photo by Maya Deren. Copy print made by the Philadelphia Museum of Art. Another version is in the Alexina and Marcel Duchamp Papers at the Philadelphia Museum of Art.

International Herald Tribune. "Problems Still Posed by Duchamp" by Michael Gibson [copy].

International Herald Tribune. "Problems Still Posed by Duchamp" by Michael Gibson.

New York Times. "The First of Our Publicity Masterpieces" by Hilton Kramer [copy].