Oldenburg : six themes ; [Walker Art Center, 6 april-25 may 1975 ; The denver Art Museum, 28 june-24 august 1975 ; Seattle Art Museum, 29 september-9 november 1975 ; New Orleans Museum of Art, 16 january-27 february 1976 ; Art Gallery of Ontario, toronto, 4 april-9 may 1976]
