Althorp Papers. Vol. ccxxxiii. 1. Miscellanous correspondence and papers of William Poyntz; 1747-1760. 2. Marriage settlement of William Poyntz of Midgham, with related correspondence and papers; 1762-1770. Partly printed.
Althorp Papers. Vols. clxxvii, clxxviii. Correspondence chiefly of George John, 2nd Earl Spencer, and his mother Georgiana, Countess Spencer, relating to the family trust set up to manage Poyntz's affairs while he was abroad; 1800-1805. Partly drafts and copies. Two volumes.
Althorp Papers. Vol. ccxxxii. Charles Poyntz's account book as executor of William Deane Poyntz (see E65 above), Elizabeth Ann Martyn and John Butterworth; 1790-1807.
Althorp Papers. Vols. ccxliii-ccxlvi. Correspondence and papers in the Exchequer suit, 1st Earl of Falmouth v. W. S. Poyntz, concerning a dispute over an exchange of property at Midgham arising from enclosure; 1767-1841. Partly printed. Four volumes.