Known Drainage/Transport Tunnels, Powerplants, Etc.: 5
20 September, 2016 16:40
List are from my own Database. I've put down the list as an alphabetic one, and not by the arbitrary ID number - the first 337 of those ID numbers is from a 1903-ish map from the USGS showing the location of mines & mills, and after that I've just added new numbers as I find some info or other reasons I find a new entity, and have the need to keep track of them.
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