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1992. Harvard Map Collection, Harvard Library and Massachusetts. Department of Public Works. This layer is a georeferenced raster image of the historic paper map entitled: Region G (Merrimack Valley and MAPC North) : functional classificati... Harvard Map Collection, Harvard Library.

2. ESRI Data & Maps 2004 : U.S. Counties (Generalized)

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1992. Environmental Systems Research Institute (Redlands, Calif.). U.S. Counties (Generalized) represents the counties of the United States in the 50 states and the District of Columbia. ESRI.

3. ESRI Data & Maps 2004 : U.S. States (Generalized)

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1992. Environmental Systems Research Institute (Redlands, Calif.). U.S. States (Generalized) represents the 50 states and the District of Columbia of the United States. ESRI.

4. ESRI Data & Maps 2005 : U.S. States (Generalized)

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1992. Environmental Systems Research Institute (Redlands, Calif.). U.S. States (Generalized) represents the 50 states and the District of Columbia of the United States. ESRI.

5. ESRI Data & Maps 2006 : U.S. Counties (Generalized)

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1992. Environmental Systems Research Institute (Redlands, Calif.). U.S. Counties (Generalized) represents the counties of the United States in the 50 states and the District of Columbia. ESRI.

6. ESRIDEMOG - World Demographics - DBMS View

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1992. ESRI. World Demographics is a table with 28 country attributes on population, vital statistics, and the economy.

7. United States States (Generalized), 2012

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1992. Environmental Systems Research Institute (Redlands, Calif.). United States States (Generalized) is a polygon theme representing the 50 states and the District of Columbia of the United States. Attribute infor... Esri.

8. Urbanized Areas: Russian River Basin, California, 1992

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1992. Circuit Rider Productions. This shapefile contains polygons that correspond to the U.S Census Bureau's urbanized area designations in the Russian River Basin in California. T... Circuit Rider Productions.

9. U.S. Counties (Generalized) : ESRI Data & Maps 2007

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1992. Environmental Systems Research Institute (Redlands, Calif.). U.S. Counties (Generalized) represents the counties of the United States in the 50 states and the District of Columbia. ESRI.

10. U.S. Counties (Generalized) : ESRI Data & Maps 2009

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1992. Environmental Systems Research Institute (Redlands, Calif.). U.S. Counties (Generalized) represents the counties of the United States in the 50 states and the District of Columbia. ESRI.