"William Swainson to John James Audubon, The Auk, vol. xv, pp. 11-13. Cambridge, 1898.
Letter dated "Tettenhanger Green, 2d October 1830"; reprinted in The Osprey, vols. iv and v (Washington, 1900).
"The unpublished correspondence of William Swainson with contemporary naturalists (1806-1840)," Proceedings of the Linnæan Society, 112th session, pp. 14-24. London, 1900.
Lists twenty-four letters of Audubon to Swainson, dating from 1 May, 1828, to 11 Jany., 1838, with brief reference to their contents. For abstract of this paper see Theodore Gill, "Swainson's Correspondence." The Osprey, vol. v, pp. 29-30 (Washington, 1900).
"Correspondence of and about Audubon with Swainson," The Osprey, vol. v, pp. 23-25. Washington, 1900.
"William Swainson and his Times," The Osprey, vols. iv and v. Washington, 1900.