Credit: C. Allen, T. Swetnam and J. Betancout, "Landscape Changes in the Southwestern United States: Techniques, Long-term Data Sets, and Trends," Land Use History of North America (LUNHA) web site: http://biology.usgs.gov/luhna/chap9.html. From: Sisk, T.D., editor. 1998. Perspectives on the land use history of North America: a context for understanding our changing environment. U.S. Geological Survey, Biological Resources Division, Biological Science Report USGS/BRD/BSR-1998-0003 (Revised September 1999). 104 pp.

Credit: C. Allen, T. Swetnam and J. Betancout, "Landscape Changes in the Southwestern United States: Techniques, Long-term Data Sets, and Trends," Land Use History of North America (LUNHA) web site: http://biology.usgs.gov/luhna/chap9.html. From: Sisk, T.D., editor. 1998. Perspectives on the land use history of North America: a context for understanding our changing environment. U.S. Geological Survey, Biological Resources Division, Biological Science Report USGS/BRD/BSR-1998-0003 (Revised September 1999). 104 pp.