40000400, Poniatowski, T370, HERCULES CLEANSING THE AUGEAN STABLE [TURNING THE COURSE OF THE ALPHEUS], KROMOU, Kromos, Bonhams, London, Private Collection, Catalogue des pierres gravées antiques de S.A. le Prince Stanislas Poniatowski ([1830?]-1833), Prendeville, J.: Explanatory catalogue of the proof-impressions of the antique gems possessed by the late Prince Poniatowski and now in the possession of John Tyrrell, Esq. (1841), Christie's, London, 19th of September 2012, lot 23, Chalcedony

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