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31. Historical United States County Boundaries, 1980

1980. Earle, Carville, Heppen, John, Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology., Otterstrom, Samuel, and Cao, Changyong. This polygon shapefile contains county boundaries for the United States in 1980. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.

32. Historical United States County Boundaries, 1990

1990. Earle, Carville, Heppen, John, Louisiana State University (Baton Rouge, La.). Department of Geography and Anthropology., Otterstrom, Samuel, and Cao, Changyong. This polygon shapefile contains county boundaries for the United States in 1990. Attributes include county and state names as well as FIPS identifi... Geoscience Publications.

33. Indian Lands of the United States, 2006

2006. National Atlas of the United States. This polygon shapefile shows Indian lands of the United States. Only areas of 640 acres or more are included. Federally-administered lands within a... National Atlas of the United States.

34. Massachusetts Block Groups 2002

2002. Geographic Data Technology, Inc. (GDT). Massachusetts Block Groups represents the U.S. Census block groups of Massachusetts. Environmental Systems Research Institute, Inc. (ESRI).

35. Massachusetts: Boston Quadrangle [1909 reprint]

1909. United States. Geological Survey. This is a scanned historical map of the Boston Quadrangle in Massachusetts shown at a scale of 1:62,500. This map was created by the US Geological ... US Geological Survey.

36. Massachusetts: Northampton sheet [1925 reprint]

1925. United States. Geological Survey. This is a scanned historical map of the Northampton Quadrangle in Massachusetts shown at a scale of 1:62,500. This map was created by the US Geolog... US Geological Survey.

37. Massachusetts Tracts 2002

2002. Geographic Data Technology, Inc. (GDT). Massachusetts Tracts represents the U.S. Census tracts and block numbering areas (BNA) of Massachusetts. Environmental Systems Research Institute, Inc. (ESRI).

38. National Wilderness Preservation System of the United States, 2006

1972. National Atlas of the United States. This polygon shapefile contains National Wilderness Preservation System areas of 640 acres or more, in the United States, Puerto Rico, and the U.S.... National Atlas of the United States.

39. State Boundaries of the United States, 2005

1972. Geological Survey (U.S.). This polygon shapefile portrays the state boundaries of the United States, and the boundaries of Puerto Rico and the U.S. Virgin Islands. The map l... Geological Survey (U.S.).

40. Time Zones of the United States, 2005

1972. National Atlas of the United States. This polygon shapefile portrays the time zones of the United States, Puerto Rico, and the U.S. Virgin Islands. Also included are the Greenwich Mean... National Atlas of the United States.