File:1836 Map of the water region of the county of Middlesex exhibiting the mode of supplying Boston & Charlestown with soft water from Spot and Mystic Ponds, by R. H. Eddy, from the Digital Commonwealth - commonwealth wd376670z.jpg
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![File:1836 Map of the water region of the county of Middlesex exhibiting the mode of supplying Boston & Charlestown with soft water from Spot and Mystic Ponds, by R. H. Eddy, from the Digital Commonwealth - commonwealth wd376670z.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/1836_Map_of_the_water_region_of_the_county_of_Middlesex_exhibiting_the_mode_of_supplying_Boston_%26_Charlestown_with_soft_water_from_Spot_and_Mystic_Ponds%2C_by_R._H._Eddy%2C_from_the_Digital_Commonwealth_-_commonwealth_wd376670z.jpg/800px-thumbnail.jpg?20211209164317)
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