found: Work cat.: William Henry Jackson Papers Digital Library Project, 2001(Wagon train crossing the Platte Bridge)
found: Encyc. Americana, 2001(Wagon trains, caravans of covered wagons that served as the principal means for settlement and supply of the far-western United States before the coming of the railroads ... Wagon caravans carried settlers and essential goods westward over the Santa Fe, Oregon, and other trails.)
found: New Encyc. Britannica, 1997:v. 12, p. 450 (Wagon train, caravan of wagons, wagon-train transportation moved westward ... wagon-train migration are more widely known and written about than wagon freighting, which also played an essential role in an expending America.)
found: Encyc. of the American West, 1997:pp. 451-454 (Wagon trains; Emigrant trains)