[4]Plastic-relief maps are no longer available from the U.S. Army Map Service but may be obtained from the T. N. Hubbard Scientific Co., Box 105, Northbrook, Ill. 60062. A topographic map at a scale of 1:250,000 of the Moab quadrangle and similar maps at a scale of 1:62,500 for the Thompson, Cisco, Moab, and Castle Valley quadrangles are available from the U.S. Geological Survey, Denver Distribution Section, Federal Center, Denver, Colo. 80225, from the Canyonlands Natural History Association at Moab, and from privately owned shops where maps are sold. Most of the park is covered by the Thompson and Moab quadrangles. The southern part of the park is shown also on the Moab 4 NW, Moab 4 NE, and Mt. Waas 3 NW quadrangles at a scale of 1:24,000. A special topographic map of Arches National Park at a scale of 1:50,000 is in preparation by the U.S. Geological Survey. These maps also may be obtained from the above-listed sources. [5]This is numbered stop 1 in the booklet referred to earlier “The Guide to an Auto Tour of Arches National Park,” and corresponds to the numeral one on a small sign at the roadside parking place. Some of the other numbers are given in the pages that follow. Index [Italic page numbers indicate major references] A Page Abajo Mountains 101 artifacts 9 Abbey, Edward 3 Aborigines, occupation of area 9 Acknowledgments _105_ Anasazi people, petroglyphs 10 Anasazi ruins 9, 103 Ancestral Colorado River 33 Anomalies, gravity, Salt Valley 32 Anticlines, salt 31 Arches, broken remains 44 examples _46_ former abutments 68 horizontal 44 how they are formed 42 natural, defined _40_ number in the park 40, _41_ origin and development 37 pothole 44 vertical 42, 44