The Old Spanish Trail Association (OSTA) records (1937-2016) sub-series consists of correspondence, meeting minutes, membership newsletters and memos, conference programs, research files, and event flyers. The OSTA records also contain files related to the Association's relationship with the Partnership for the National Trails System (PNTS). PNTS files are present within the series’ of both OSTA and the Goodsprings Historical Society (GHS), as the GHS also worked with the PNTS regarding the designation of the Yellow Pine Mine Trail, which is located in the Goodsprings branch of the Old Spanish Trail. Because of von Till Warren’s involvement with several organizations simultaneously, there is also overlap from the Preservation Association of Clark County (PACC), Goodsprings Historical Society (GHS), Goodsprings Citizens Advisory Council (GCAC), the Old Mormon Fort, Spring Mountain Ranch, and Springs Preserve.