Diary & Letters of Josiah Gregg ... Edited by Maurice Garland Fulton. [With an Introduction to Each Volume by Paul Horgan.].
Commerce of the Prairies, Or the Journal of a Santa Fé Trader During Eight Expeditions Across the Great Western Prairies and a Residence of Nearly Nine Years in Northern Mexico... by Josiah Gregg...
Josiah Gregg and Dr. George Engelmann. [Letters from J. Gregg to G. Engelmann.] Edited with Introduction and Notes by John Thomas Lee. Reprinted from the Proceedings of the American Antiquarian Society, Etc