'9 at Castelli', Castelli Warehouse, New York, 4 December - 28 December 1968.

'Some Recent American Art', International Council of The Museum of Modern Art, New York, cat. no. 56 (ill.); travelled to National Gallery of Victoria, Melbourne, 12 December 1973 - 16 January 1974; to Art Gallery of Western Australia, Perth, 13 February - 17 March 1974; to Art Gallery of New South Wales, Sydney, 15 April - 12 May 1974; to Art Gallery of South Australia, Adelaide, 10 June - 7 July 1974; to Queensland Art Gallery, Brisbane, 5 August - 1 September 1974; to City of Auckland Art Gallery, 14 October - 17 November 1974.

'Object and Content: Meaning in Minimal Art', Australian National Gallery at the Drill Hall Gallery, Canberra, 24 November 1990 - 20 January 1991, no cat. no.