Between 1841 and 1866, more than 500,000 people followed trails to Oregon, California, and the Salt Lake Valley in one of the greatest mass migrations in American history. This collection of travelers' accounts of their journeys in the 1840s, the first volume in a new series of trail narratives, comprises excerpts from pioneer and missionary letters, diaries, journals, and memoirs-many previously unpublished-accompanied by biographical information and historical background.