Catalogues Raisonnés
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MacDonald, Margaret F., James McNeill Whistler. Drawings, Pastels and Watercolours. A Catalogue Raisonné, New Haven and London, 1995 (cat. no. 1556) as 'r.: Butterfly and tricolour flag; v.: Two butterflies and part of a third'.
Authored by Whistler
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Whistler, James McNeill, Eden versus Whistler: The Baronet and the Butterfly. A Valentine with a Verdict, Paris: Louis-Henry May, 1899, p. viii.
Last updated: 9th April 2019 by Margaret