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41. Hydrographic Lines, North America, 2004

2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This line shapefile shows the coastline, linear hydrographic features, and area hydrographic features in North America. This data set was produced ... Geological Survey (U.S.).

42. Hydrography, North America, 2004

2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Geological Survey (U.S.), and Canada Centre for Remote Sensing. This polygon shapefile shows areas of coastline, and other hydrographic features in North America. This data set was produced using digital files s... Geological Survey (U.S.).

43. Hydrologic investigations atlas

Geological Survey (U.S.). U.S. Geological Survey,.

44. Hydrologic unit map[s] 1974 [of states of the United States] /

Geological Survey (U.S.). The Survey,.

45. Landforms of the conterminous United States a digital shaded-relief portrayal /

Geological Survey (U.S.). The Survey ;.

46. Landslide Incidence and Susceptibility in the Conterminous United States

2001. Geological Survey (U.S.) and Godt, Jonathan W. These polygon shapefile is a digital version of U.S. Geological Survey Professional Paper 1183, Landslide Overview Map of the Conterminous United S... National Atlas of the United States.

47. Major Dams of the United States, 2002-2004

2002. Geological Survey (U.S.). This point shapefile portrays major dams of the United States, including Puerto Rico and the U.S. Virgin Islands. The map layer was created by extr... Geological Survey (U.S.).

48. Major Roads of the United States, 1972-1999

1972. Geological Survey (U.S.). This line shapefile portrays the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The file was produced by joining the i... Geological Survey (U.S.).

49. Map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains /

Geological Survey (U.S.). The Survey ;.

50. National atlas of the United States of America Presidential elections, 1789-2008 /

Geological Survey (U.S.). U.S. Dept. of the Interior, U.S. Geological Survey ;.