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- Civilian Conservation Corps (U.S.)34
- Forests and forestry--Massachusetts--Andover--Photographs31
- Dams--Design and construction--Massachusetts--Andover--Photographs10
- Ponds--Massachusetts--Andover--Photographs8
- Roads--Design and construction--Massachusetts--Andover--Photographs5
- Depressions--19293
- Forests and forestry--Massachusetts2
- Forests and forestry--Vermont2
Current results range from 1930 to 1982