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AZSA_004 - Petroglyphs at Signal Hill and Tucson Mountains, Saguaro National Park Arizona.jpg
AZSA_004 - Evening light warms petroglyphs on boulders at Signal Hill which were left here by Hohokam people perhaps 1000 years ago, Tucson Mountain District, Saguaro National Park, Arizona, USA --- (4x5 inch original, File size: 7691x6000, 132mb uncompressed)