"Devils Postpile" by U.S. National Park Service , public domain
 | CA Timer Knob 2021US Topo 7.5-minute |
US Topo 7.5-minute map of Timer Knob Quadrangle in California. Published by the U.S. Geological Survey (USGS).
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CA Timer Knob 2021
US Topo 7.5-minute
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