40000401, Poniatowski, T371, HERCULES KILLING AUGEAS [WHO IS LYING ON THE GROUND WITH UPLIFTED ARM], KROMOU, Kromos, Bonhams, London, 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, 5 Feb 2020, lot 237, Cornelian