The Oregon-California Trails Association (a non-profit, 501 (C) (3) Association) is the nation's largest and most influential organization dedicated to the preservation and protection of overland emigrant trails and the emigrant experience. OCTA members protect the trails to prevent the destruction of trail remnants, graves and other trail-related sites. Members also place markers on the trails and maintain existing markers. OCTA also encourages the study of the trails through its publications and through the development of classroom materials for teachers. Members also map the trails and collect data for the documentation of overland diaries, newspapers and other materials. OCTA headquarters are located on the grounds of National Frontier Trails Museum (318 West Pacific, Independence, MO 64051) and house our Merrill J. Mattes Research Library.