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You can get a lot of the way towards understanding which ground has a good likelihood of being marshy from full use of Ordnance Survey (or equivalent) maps, and looking at the type of rock in the a...
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#1: Attribution notice removed
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System
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2020-05-27T11:08:39Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/1815 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/