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1. 1:1,000,000-Scale Contours of the Conterminous United States

2014. Geological Survey (U.S.). This line shapefile shows elevation contour lines for the conterminous United States. The map layer was derived from the 100-meter resolution eleva... National Atlas of the United States.

2. 1:1,000,000-Scale County Boundary Lines of the United States, 2014

2014. Geological Survey (U.S.). This polygon shapefile contains the county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. This layer was derived from t... Geological Survey (U.S.).

3. 1:1,000,000-Scale Ferries of the United States, 2014

2014. National Atlas of the United States. This map layer portrays the ferries on major roads in the United States and Puerto Rico. Ferries are ships that carry vehicles, passengers, and car... National Atlas of the United States.

4. 1:1,000,000-Scale Major Roads of the United States, 2012

2012. Geological Survey (U.S.). This map layer portrays the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The file was produced by joining the indivi... Geological Survey (U.S.).

5. 1:1,000,000-Scale Railroads, United States, 2012

2012. National Atlas of the United States. This line shapefile represents railroads in the conterminous United States and Alaska for 2012 at 1:1,000,000 scale. This layer is part of the 1997... National Atlas of the United States.

6. 1:1,000,000-Scale Railroads, United States, 2014

2014. National Atlas of the United States. This line shapefile represents railroads in the conterminous United States and Alaska for 2014 at 1:1,000,000 scale. This is a revised version of t... National Atlas of the United States.

7. 1:1,000,000-Scale Streams of the United States, 2014

2014. Geological Survey (U.S.). This map layer shows streams of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was produced primarily from the Medium-R... Geological Survey (U.S.).

8. Airport Runways: United States and Territories, 2011

2011. United States. Bureau of Transportation Statistics and United States. Federal Aviation Administration. The Airport Runways database is a geographic dataset of runways in the United States and its Territories containing information on the physical cha... United States. Bureau of Transportation Statistics.

9. Alabama Major Roads 2002

1999. Geographic Data Technology, Inc. (GDT). Alabama Major Roads represents interstate, U.S., and state highways and other major thoroughfares within Alabama. Environmental Systems Research Institute, Inc. (ESRI).

10. Alabama Rivers 2002

1997. Geographic Data Technology, Inc. (GDT). Alabama Rivers represents streams and rivers within Alabama. Environmental Systems Research Institute, Inc. (ESRI).

11. Alaska Major Roads 2002

1999. Geographic Data Technology, Inc. (GDT). Alaska Major Roads represents interstate, U.S., and state highways and other major thoroughfares within Alaska. Environmental Systems Research Institute, Inc. (ESRI).

12. Alaska Rivers 2002

1997. Geographic Data Technology, Inc. (GDT). Alaska Rivers represents streams and rivers within Alaska. Environmental Systems Research Institute, Inc. (ESRI).

13. Alaska (Rivers, 2010)

Tele Atlas North America, Inc. and ESRI. U.S. and Canada Rivers represents rivers and other linear water features within the United States and Canada.This data set provides six feature cla... Tele Atlas North America, Inc.

14. Arizona Major Roads 2002

1999. Geographic Data Technology, Inc. (GDT). Arizona Major Roads represents interstate, U.S., and state highways and other major thoroughfares within Arizona. Environmental Systems Research Institute, Inc. (ESRI).

15. Arizona Rivers 2002

1997. Geographic Data Technology, Inc. (GDT). Arizona Rivers represents streams and rivers within Arizona. Environmental Systems Research Institute, Inc. (ESRI).

16. Arkansas Major Roads 2002

1999. Geographic Data Technology, Inc. (GDT). Arkansas Major Roads represents interstate, U.S., and state highways and other major thoroughfares within Arkansas. Environmental Systems Research Institute, Inc. (ESRI).

17. Arkansas Rivers 2002

1997. Geographic Data Technology, Inc. (GDT). Arkansas Rivers represents streams and rivers within Arkansas. Environmental Systems Research Institute, Inc. (ESRI).

18. 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.

19. California Major Roads 2002

1999. Geographic Data Technology, Inc. (GDT). California Major Roads represents interstate, U.S., and state highways and other major thoroughfares within California. Environmental Systems Research Institute, Inc. (ESRI).

20. California Rivers 2002

1997. Geographic Data Technology, Inc. (GDT). California Rivers represents streams and rivers within California. Environmental Systems Research Institute, Inc. (ESRI).