Robert R. McElroy. Claes Oldenburg's Store Days, 1962 Feb. 23. Ellen Hulda Johnson papers, 1872-2018. Archives of American Art, Smithsonian Institution.
Claes Oldenburg. Claes Oldenburg, announcement for the Ray Gun Spex, 1960 Feb. 29 - Mar. 2. Ellen Hulda Johnson papers, 1872-2018. Archives of American Art, Smithsonian Institution.
Robert R. McElroy. Claes Oldenburg at work in his studio, 1961. Ellen Hulda Johnson papers, 1872-2018. Archives of American Art, Smithsonian Institution.
Claes Oldenburg. Claes Oldenburg artist's statement for the Environments, situations, spaces catalog, 1961 May. Ellen Hulda Johnson papers, 1872-2018. Archives of American Art, Smithsonian Institution.
Ellen Hulda Johnson and Claes Oldenburg at Hammarskjold Plaza, 1974. Ellen Hulda Johnson papers, 1872-2018. Archives of American Art, Smithsonian Institution.
Claes Oldenburg and Leo Castelli with Castelli's dog Paddy Boy, between 1970 and 1990. Leo Castelli Gallery records, circa 1880-2000. Archives of American Art, Smithsonian Institution.
Claes Oldenburg, visiting artist, 1973. Skowhegan School of Painting and Sculpture records, 1945-2013. Archives of American Art, Smithsonian Institution.
John Gibson (Gallery) and Lucy R. Lippard. Ecologic Art exhibition, 1969 May 14. Lucy R. Lippard papers, 1930s-2010. Archives of American Art, Smithsonian Institution.
Ellen H. Johnson. Ellen H. Johnson letter to Claes Oldenburg, with handwritten responses by Oldenburg, 1969 July 29. Ellen Hulda Johnson papers, 1872-2018. Archives of American Art, Smithsonian Institution.
Claes Oldenburg. Claes Oldenburg letter to Ellen H. Johnson, 1969. Ellen Hulda Johnson papers, 1872-2018. Archives of American Art, Smithsonian Institution.