Recreation, Wilderness, and other maps are available and may be purchased at any Forest Office. Some sporting goods stores, outfitters, and map stores also sell these maps. The Three Forests Interpretive Association, a non-profit organization, sells interpretive books and visitor materials at Stanislaus National Forest offices. Selections include trail guides, natural history and nature guides, and books on local history. Profits from sales are returned to the National Forests to help fund interpretive activities.