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31. Agricultural Minerals Operations
2003. Geological Survey (U.S.). This point shapefile represents locations of agricultural minerals operations in the United States. The data represent commodities covered by the M... National Atlas of the United States.
32. Agriculture Census of the United States, 2002
2002. National Atlas of the United States. This polygon shapefile portrays a selected set of information that was collected for the 2002 Census of Agriculture by the National Agricultural St... National Atlas of the United States.
33. Agriculture Census of the United States, 2007
2007. National Atlas of the United States. This polygon shapefile portrays a selected set of information that was collected for the 2007 Census of Agriculture by the National Agricultural St... National Atlas of the United States.
34. Aids to Navigation, Northeast United States, 2012
2012. I.M. Systems Group. This point shapefile represents marine aids to navigation in the Northeastern United States. The Coast Guard maintains systems of marine aids to na... Coastal Services Center (U.S.).
35. Airports of the United States, 2012
2012. Geological Survey (U.S.). This point shapefile includes airports in the United States, Puerto Rico and the U.S. Virgin Islands. The data were derived from an extract of the ... Geological Survey (U.S.).
36. An accurate map of Rhode Island, part of Connecticut and Massachusets [sic] : shewing Admiral Arbuthnot's station in blocking up Admiral Ternay
Lodge, John, -1796. Covers Rhode Island, the eastern half of Connecticut, southeastern Massachusetts as far east as Falmouth and Martha's Vineyard, and eastern Long Is... London : J. Bew, 1780.
37. Anchorages, Northeast United States, 2013
2013. Baldwin Group. This polygon shapefile represents anchorages in the Northeastern United States. The areas described are designated as special anchorage areas for p... Coastal Services Center (U.S.).
38. Areas and Facies Types of Metamorphism: Geology of the Conterminous United States, 2005
2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the outlines of major calderas and impact structures in the United States. This layer is part of the Geologic Map of the ... Geological Survey (U.S.).
39. Bailey's Ecoregions and Subregions of the United States, 2004
2004. United States. Forest Service. This polygon shapefile is commonly called Bailey's ecoregions and shows ecosystems of regional extent in the United States, Puerto Rico, and the U.... National Atlas of the United States.
40. Bathymetric Shaded Relief of North America
2001. National Atlas of the United States. The Bathymetric Shaded Relief of North America map layer shows depth ranges using colors, with relief enhanced by shading. The image was derived fr... National Atlas of the United States.