Josiah Gregg. Commerce of the Prairies. Philadelphia, 1844.

William Barr. Journal of a march from Delhi to Peshawur. London, 1844.

Tennessee born Josiah Gregg (1806-1850) was a merchant, explorer, naturalist, and author who worked for nine years from 1831 as a trader along the Santa Fe Trail. His account of the trail’s varmints, fauna, flora and native tribes established Gregg's literary reputation. He was subsequently hired as a news correspondent during the Mexican-American War. After the war, Gregg participated in the California Gold Rush and died from starvation and exposure while leading an expedition out of a snow bound mining camp.