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Date: 2010-11-30 21:02:48Volcanology Volcanic rocks Igneous rocks Andesite Porphyry Rhyolite Aphanite Tuff Lava Petrology Igneous petrology Geology | U.S. Department of Interior U.S. Geological Survey Interpretive Geologic Map of Mt Ajo Quadrangle, Organ Pipe Cactus National Monument, Arizona by Janet L. BrownAdd to Reading ListSource URL: pubs.usgs.govDownload Document from Source WebsiteFile Size: 305,15 KBShare Document on Facebook |