Surtees, A Catalogue Raisonné, vol. 1, 182 (no. 418).
Mrs. Nicholson, know in DGR's circle as “Red Lion Mary”, was the housekeeper at Red Lion Square. See DGR's letter to her in response to her letter of condolence on the death of DGR's wife (
Fredeman, Correspondence, 62. 19