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51. 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.

52. 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.

53. Bathymetry of North America

2001. National Atlas of the United States. The Bathymetry of North America map layer shows depth ranges using colors. The image was derived from the National Geophysical Data Center's ETOPO2... National Atlas of the United States.

55. Berks County, Pennsylvania land parcels, 2008

2008. Boundary Solutions, Inc. Land parcels in Berks County, Pennsylvania, 2008.

56. Berks County, Pennsylvania land parcels, 2011

2011. Boundary Solutions, Inc. Land parcels in Berks County, Pennsylvania, 2011.

57. Berks County, Pennsylvania land parcels, 2014

2014. Boundary Solutions, Inc. Land parcels in Berks County, Pennsylvania, 2014.

58. Blair County, Pennsylvania land parcels, 2014

2014. Boundary Solutions, Inc. Land parcels in Blair County, Pennsylvania, 2014.

59. Blair County, Pennsylvania roads, 2014

2014. U.S. Department of Commerce, U.S. Census Bureau, Geography Division, Geographic Products Branch. Roads and highways in Blair County, Pennsylvania, 2014. The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geog...

60. Breeding Bird Survey Route Locations for Lower 48 States, 1966-1998

1966. Patuxent Wildlife Research Center. This line shapefile portrays the current routes used for conducting Breeding Bird Surveys in the lower 48 States. This layer is part of the 1997-20... National Atlas of the United States.