Today Yellowstone’s Naturalist Division stands as the symbol of America’s love for the great out-of-doors. Its philosophy is wise and comprehensive. Its scientists have delved deeply for the facts. Still, there is a spirit of self-abnegation among the personnel. They serve all and sundry in every possible way, and yet they are pledged to the preservation of the natural treasures. Their contribution to protection of park values is shared with that of the ranger staff. The number of public contacts runs into the hundreds of thousands annually. Wise, indeed, is the tourist who avails himself of this free guide service. The principal points of interest are visited over footpath or by auto caravan. Daily schedules of these activities are posted, and an illustrated lecture is held in an amphitheater each night. Many citizens have expressed their satisfaction with this naturalist service: He unravelled before our city-wearied eyes the skein of beauty nature has hidden in this great preserve. With skillful phrase he repictured for us the aeons during which the mountains were wrinkling and the cobalt lakes were born. His keen eyes found us mountain sheep ... his wide knowledge compassed the flowers and birds along the way. He knew when and where to take us to see the beaver at work, and where the water ouzel bubbled forth its cascade of song. He answered all our questions with calm courtesy. Around the nightly campfire he brought to us in song and story the romance and exuberance of the west.... The fire of his enthusiasm welded us to the National Park idea and out-of-doors as nothing had ever done. We returned to the east inspired by a new understanding of the greatness of America and the magnificence of its beauty.[345] In 1928 the Laura Spelman Rockefeller Foundation made a donation to be used by the American Association of Museums in the Park. Under the direction of Dr. Hermon C. Bumpus museums were erected at Old Faithful, Madison, Norris and Fishing Bridge. The main museum at Mammoth was improved and a number of roadside exhibits were established.[346] Mission 66 was begun by the National Park Service in 1956. It is a conservation program to assure full protection of irreplaceable scenic, scientific and historic treasures and to develop and staff the Parks to permit their wisest possible use for your enjoyment. Completion is scheduled for 1966, the 50th anniversary of the establishment of the National Park Service, hence Mission 66. Under this program, new roads, bridges, campgrounds and other facilities are being built. A fine new visitor center was opened in 1958 at Canyon Village and a large number of attractive new roadside exhibits and signs interpret the human and natural history of the great natural museum that is Yellowstone.