Retrieved September 30, 2008, from Encyclopædia Britannica Online: http://www.britannica.com/EBchecked/topic/243212/Great-Drought*A 1,200-year perspective of 21st century drought in southwestern North America Online: http://www.pnas.org/content/107/50/21283.full==External links==*Bandelier National Monument Virtual Museum Exhibit and Lesson Plans, from National Park Service*Chaco Culture National Historic Park Virtual Museum Exhibit, from National Park Service*People of the Colorado Plateau*An Early Population Explosion on the Colorado Plateau*The People of the Mountains, Mesas and Grasslands*Cliff Palace of the Anasazi Photo*1054 Supernova Petrograph*The Chaco Meridian*Life Lists at SmithsonianMag.com: Mesa Verde*A 1,200-year perspective of 21st century drought in southwestern North America
ISBN 0-684-81078-6.