Collection Overview Collection summary derived from "Guidebook to Manuscripts", 1969: Often called "the Historian of the Santa Fe Trade," Josiah Gregg (1806-1850) was an early trader, and the author of Commerce of the Prairies, published in 1844: These papers consist of sixteen letters to his brother John concerning business and trade and also tell something of his work as a doctor. There are several "memorandum books." One notebook contains notes made while he was in medical school at Louisville, Kentucky. A...