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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14287849
Trinalcove. This canon is 55 1/2 miles long and from 300 to 2,000 feet deep. [Green River. Labyrinth Canon.] by Elias Olcott Beaman
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Trinalcove. This canon is 55 1/2 miles long and from 300 to 2,000 feet deep. [Green River. Labyrinth Canon.] by Elias Olcott Beaman

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Trinalcove. This canon is 55 1/2 miles long and from 300 to 2,000 feet deep. [Green River. Labyrinth Canon.] by Elias Olcott Beaman

Original public domain image from Getty Museum

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