C. Neve, Leon Underwood, London, 1974, p. 198, pl. 156, another cast illustrated, as 'Hill Rhythm'.
B. Whitworth, The Sculpture of Leon Underwood, Aldershot, 2000, pp. 83, 115, 136, no. 151, another cast illustrated.
London, Beaux Arts Gallery, Leon Underwood, May - June 1953, no. 31, another cast exhibited.
London, Zwemmer Art Gallery, Sculpture and Drawings: Henry Moore, Marino Marini, Barbara Hepworth, F. E. McWilliam, Epstein, Leon Underwood, June 1957, another cast exhibited, catalogue not traced.
London, Kaplan Gallery, Sculpture by Leon Underwood, March 1961, no. 6, another cast exhibited.
New York, N.M. Acquavella Galleries, Sculpture by Leon Underwood, October - November 1962, no. 3.
London, Royal Academy, 1966, no. 1465, another cast exhibited.
Colchester, The Minories, Leon Underwood: A Retrospective Exhibition, August - September 1969, no. 42, another cast exhibited.
London, Archer Gallery, Leon Underwood, Michael Aram and Georges Brunon, October - November 1969, no. 14, another cast exhibited.