RT @USGS: [PUB] – ‘Classic’ USGS Publication - Guidebook of the Western United States: Part E - The Denver & Rio Grande Western Route Bulle…
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RT @USGS: [PUB] – ‘Classic’ USGS Publication - Guidebook of the Western United States: Part E - The Denver & Rio Grande Western Route Bulle…
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[PUB] – ‘Classic’ USGS Publication - Guidebook of the Western United States: Part E - The Denver & Rio Grande Western Route Bulletin 707 (1922) https://t.co/oVzGa8oHDV #geology #guidebook #Colorado #Utah https://t.co/JywJ16NJDP
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RT @USGS: [PUB] – ‘Classic’ USGS Publication - Guidebook of the Western United States: Part E - The Denver & Rio Grande Western Route Bulle…