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terrain.org
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Skroch, Matt (21 January 2008). "Sky Islands of North America". Terrain.org. Winter/Spring 2008 (21). Terrain Publishing. ISSN1932-9474. Archived from the original on October 7, 2017. Retrieved October 4, 2017.
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wilderness.net
"Saguaro Wilderness". Wilderness Connect. U.S. Government and The University of Montana. Archived from the original on September 5, 2017. Retrieved June 14, 2017. The map at this site, when zoomed out sufficiently, outlines the wilderness areas in both districts.
"Rincon Mountain Wilderness". Wilderness Connect. U.S. Government and The University of Montana. Retrieved May 18, 2017.
Skroch, Matt (21 January 2008). "Sky Islands of North America". Terrain.org. Winter/Spring 2008 (21). Terrain Publishing. ISSN1932-9474. Archived from the original on October 7, 2017. Retrieved October 4, 2017.