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USGS: extremely based, great science, cool travel guides
USGS: extremely based, great science, cool travel guides
RT @GeolAssoc: This looks to be a great free resource from @USGS
This looks to be a great free resource from @USGS
RT @USGS: [PUB] Field-trip guides to selected volcanoes and volcanic landscapes of the western United States. Field trips in this guide bβ¦