This slide set was made possible through the help of numerous people. Kim Malville (University of Colorado at Boulder) was generous beyond the call of duty in providing reprints and preprints of recent and/or hard to find papers, and in providing us photographic and video material, as well as answering our barrage of questions. Michael Zeilik (University of New Mexico in Albuquerque) provided constructive criticism on an early draft of the text, as well as numerous reprints and preprints. Florence Lister also provided useful suggestions. Mrs. Marcia Logsdon kindly granted us permission to make use of some of her husband's beautiful aerial photographs. We also benefited from the computer graphics expertise of Don Middleton and Tim Scheitlin (SCD/NCAR). Finally, PC and ORW wish to thank Chaco Culture Park superintendant Butch Wilson for granting us permission to accompany the 1997 summer solstice monitoring team to the 3-slab site, and Park rangers G.B. Cornucopia and Gary Henson for their pleasant company throughout a most enjoyable day on Fajada butte. Wendy Hawkins transposed pages to DRUPAL in November 2018 and updated some information. The High Altitude Observatory is a division of the National Center for Atmospheric Research, which is sponsored by the National Science Foundation.

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