RT @AZGeology: The US Geological Survey (USGS) issued a fresh report on sand storage in the Colorado River in Grand Canyon National Park…
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RT @AZGeology: The US Geological Survey (USGS) issued a fresh report on sand storage in the Colorado River in Grand Canyon National Park…
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RT @AZGeology: The US Geological Survey (USGS) issued a fresh report on sand storage in the Colorado River in Grand Canyon National Park…
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The US Geological Survey (USGS) issued a fresh report on sand storage in the Colorado River in Grand Canyon National Park from July 2017 to June 2020. @USGSAZ #GrandCanyon https://t.co/WYa0ZlKBj4 https://t.co/a9figZ5dTs