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This is impossible to answer unless you are willing to do an enormous amount of research. There is no single, or even just a few, databases of trails in the US. The national trail lists generally...
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#1: Attribution notice removed
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System
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2020-06-03T15:54:20Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/9927 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/