Western National Parks Association (WNPA) is a nonprofit cooperating association of the National Park Service. Headquartered in Tucson, Arizona, the association was founded in 1938 as the Southwest Monuments Association to support the interpretive activities of the National Park Service. Today, WNPA operates stores selling books and gifts in sixty-five National Park Service sites throughout the western United States, including the park store at the Tumacácori visitor center. In addition to developing publications for parks, WNPA supports park research and helps fund programs that make park visits more meaningful. The Tumacácori visitor center WNPA store features memorable items and high quality, often hard to find publications on subjects related to Tumacácori, missions, and the natural and cultural history of the Pimería Alta region.
Western National Parks Association