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- Geological Survey (U.S.)✖[remove]7
- Electric lines--Connecticut--Maps1
- Electric lines--Massachusetts--Maps1
- Electric lines--Rhode Island--Maps1
- Electric power transmission--Connecticut--Maps1
- Electric power transmission--Massachusetts--Maps1
- Electric power transmission--Rhode Island--Maps1
- Power-plants--Connecticut--Maps1
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Current results range from 1890 to 1921