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Harquahala Mountain Professional Review and Guide
"A BLM National Byway which climbs to the top of 5,681- ft. Harquahala Peak, the highest mountain in southwestern Arizona. At the top, find an observatory built by the Smithsonian Institution in use from 1920 to 1925. Information panels explain the history. You’ll find picnic tables and plenty of parking room—a great spot for lunch. Large solar collectors at the top are used by the Central Arizona Project."
--Charles A. Wells & Matt Peterson, ATV Trails Guide Arizona: Phoenix Region (FunTreks).
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