Digital Commonwealth — Boston Public Library
Map of Charles River showing principal sources of pollution
Boston (Mass.). Engineering Dept · 1892
Crossing Boundaries exhibition: The 1892 blueprint map by the Boston Engineering Department takes an analytical approach, pinpointing sources of pollution of the Charles River and grading them from “Serious” to “Abominable Nuisance.” Today, a concerted cleanup effort has led to a rating by the Environmental Protection Agency of “A-minus,” and plans for a swimming venue on the Charles are underway.
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