Mineral resources of the Gibraltar Mountain and Planet Peak Wilderness Study Areas, La Paz County, Arizona
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Bulletin↗
Geology topics
Jon E. Spencer
Publications and source records attributed to Jon E. Spencer.
Geologic excursions through the Sonoran Desert Region, Arizona and Sonora
This technical publication is the field trip guidebook to the 86th annual meeting of the Geological Society of America.
Arizona↗
Geologic map of part of the northwestern Sacramento Mountains, southeastern California
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Open-File Report↗