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31. Classification of Forest Fragmentation in North America, 1992

1992. Ritters, Kurt. This raster layer is a grid map of North America including the Caribbean and most of Mexico in GeoTIFF format. The map layer is an excerpt from a g... National Atlas of the United States.

32. Spread of Africanized Honey Bees in the United States, 1990-2005

1990. United States. Agricultural Research Service. This polygon shapefile portrays the spread, by year, of the Africanized honey bee (AHB) in the United States, Puerto Rico, and the U.S. Virgin Isla... National Atlas of the United States.

33. Coastal Barrier Resource System, Northeast United States, 1982-2008

1982. Coastal Services Center (U.S.), United States. National Oceanic and Atmospheric Administration, and United States. National Ocean Service. The Coastal Barrier Resources Act (CBRA) of 1982 established the John H. Chafee Coastal Barrier Resources System (CBRS), comprised of undeveloped c... United States. National Ocean Service.

34. Coastal Wetlands, Northeast United States, 1977-2014

1977. U.S. Fish and Wildlife Service. This polygon shapefile represents the extent, approximate location and type of wetlands and deepwater habitats in the Northeastern United States be... U.S. Fish and Wildlife Service.

35. Shellfish Habitats for Maine, Massachusetts, and New Hampshire, 1975-2013

1975. Nature Conservancy (U.S.). This shellfish habitat layer was derived from datasets from Maine, Massachusetts and New Hampshire state GIS resources. Shapefiles downloaded/provi... Northeast Ocean Data.

36. 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.

37. 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.

38. Wildland Fires, USA, 1937 to 2017

1937. Wildland Fires documented by the National Park service between 1937 and 2017. National Park Service.

39. Significant United States Earthquakes, 1568-2009

1568. Geological Survey (U.S.). This point shapefile contains the locations and attributes of significant, historic earthquakes that caused deaths, property damage, and geological... National Atlas of the United States.