RT @USGS: [PUB] ‘Classic’ USGS publication - Rate of recession of Niagara falls, accompanied by a report on the survey of the crest Bullet…
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RT @USGS: [PUB] ‘Classic’ USGS publication - Rate of recession of Niagara falls, accompanied by a report on the survey of the crest Bullet…
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RT @USGS: [PUB] ‘Classic’ USGS publication - Rate of recession of Niagara falls, accompanied by a report on the survey of the crest Bullet…
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RT @USGS: [PUB] ‘Classic’ USGS publication - Rate of recession of Niagara falls, accompanied by a report on the survey of the crest Bullet…