File:1892 Map of Charles River showing principal sources of pollution by the Boston Engineering Dept, from the Digital Commonwealth - commonwealth 3f4635739.jpg
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![File:1892 Map of Charles River showing principal sources of pollution by the Boston Engineering Dept, from the Digital Commonwealth - commonwealth 3f4635739.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/1892_Map_of_Charles_River_showing_principal_sources_of_pollution_by_the_Boston_Engineering_Dept%2C_from_the_Digital_Commonwealth_-_commonwealth_3f4635739.jpg/409px-1892_Map_of_Charles_River_showing_principal_sources_of_pollution_by_the_Boston_Engineering_Dept%2C_from_the_Digital_Commonwealth_-_commonwealth_3f4635739.jpg?20211129181741)
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