2014. United States. Bureau of Transportation Statistics and Hunt, Raquel. The Rail Network is a comprehensive database of the United States railway system at 1:24,000 to 1:100,000 scale. This polyline shapefile covers all... United States. Bureau of Transportation Statistics.
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2014. United States. Bureau of Transportation Statistics and Hunt, Raquel. The Rail Network is a comprehensive database of the nation's railway system at 1:24,000 to 1:100,000 scale. This point shapefile covers all 50 Stat... United States. Bureau of Transportation Statistics.
1997. This polygon shapefile contains ice observations in the Arctic region for May 12, 1997. This layer is part of the Arctic Climate System (ACSYS) His... Arctic Climate System (ACSYS).
2014. This point shapefile depicts grade crossings and originates from the National Highway-Rail Crossing Inventory Program. A crossing is defined as tho... United States. Bureau of Transportation Statistics.
4555. Map of South America
1921. National Geographic Society (U.S.). Relief shown by shading and spot heights.; Includes "Abbreviations and translations."; Insets: Galäpagos Archipelago.--Economic map of South Ameri... National Geographic Society (Washington), 1921.
2006. World Wildlife Fund. This river network (stream lines) map for South America is derived from the flow direction map for South America. The flow accumulation map for Sou... Geological Survey (U.S.).
2006. World Wildlife Fund. This river network (stream lines) map for South America is derived from the flow direction map for South America. The flow accumulation map for Sou... Geological Survey (U.S.).
1918. Gabrys, J. Relief shown by spot heights. 80 x 106 centimeters Scale 1:5,000,000 General Map Collection. Librairie centrale des nationalités (Lausanne).
1921. National Geographic Society (U.S.). Map Department. Issued with the National Geographic magazine, volume 40, no. 6, Dec. 1921. 46 x 61 centimeters Scale 1:22,375,000 General Map Collection. The Society (Washington, D.C), 1921.
1990. This polygon shapefile contains ice observations in the Arctic region for December 24, 1990. This layer is part of the Arctic Climate System (ACSYS... Arctic Climate System (ACSYS).