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1936 - 1977, Circle: International Survey of Constructive Art, 1937
                                    
Source: 1961 - 1975, Barbara Hepworth, A Pictorial autobiography', 1970, p. 283
                                        
                                        London: Faber and Faber 
1936 - 1977, Circle: International Survey of Constructive Art, 1937
                                    
                                        
                                        1970 and later 
Source: 'The Sunday Times', 25 May 1975; as quoted in Henry Moore writings and Conversations, ed. Alan Wilkinson, University of California Press, California 2002, p. 121
                                    
                                        
                                        The Diary Of Anais Nin, Volume Two (1934-1939) 
Diary entries (1914 - 1974)
                                    
1950s - 1960s, Excerpt, What Abstract Art Means to Me (1951)
Source: 1925 - 1940, The sculptor speaks' (1937), pp. 254-255
                                        
                                        Faithless Nellie Gray; reported in Bartlett's Familiar Quotations, 10th ed. (1919). 
20th century
                                    
Source: 1969 - 1980, In: "Ellsworth Kelly: Works on Paper," 1987, p. unknown : 'Notes from 1969'
                                        
                                        Quote (1951), in  'What Abstract Art Means to Me' http://www.jstor.org/stable/4058250, George L. K. Morris, Willem De Kooning, Alexander Calder, Fritz Glarner, Robert Motherwell, Stuart Davis; as cited in the The Bulletin of the Museum of Modern Art, Vol. 18, No. 3, (Spring, 1951), pp. 2-15 
1950s - 1960s
                                    
                                        
                                        from Rauschenberg, Barbara Rose, Vintage Books, New York, 1987, p. 86 
1980's
                                    
                                        
                                        Quote in a letter to Edma, 1869, in Morisot's Correspondence, p. 32; as cited by Margaret Sehnan in Berthe Morisot, the first lady of Impressionism; Sutton Publishing, 1996 - (ISBN 0 7509 2339 3), p. 86 
1860 - 1870
                                    
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        