1975. 2012-05-03T15:55:10Z. 2012-05-09T14:06:25Z. Nelson, Arthur E. (Arthur Edward), 1922-. The Survey. English. Public. Massachusetts, Worcester County, and Middlesex County.
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1974. 2012-04-24T19:29:56Z. 2012-05-03T15:41:34Z. Nelson, Arthur E. (Arthur Edward), 1922-. U.S. Geological Survey. English. Public. Massachusetts, Middlesex County, and Worcester County.