The Frick Collection/Frick Art Reference Library Archives. Henry Clay Frick Papers, Series I: Art Files, 1909 letter from M. Knoedler & Co. to Henry Clay Frick describing the sale and transfer of the painting Mrs. Harcourt (afterwards Countess) by Sir Joshua Reynolds (now titled Mary, Countess Harcourt and in a private collection) to J. Pierpont Morgan.