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21. Magnetic Field - Secular Variation of the Declination Component for the Epoch 2010.0

2010. National Geophysical Data Center. This map layer shows isoporic lines (lines of equal annual change, or secular variation, in the declination of the Earth's magnetic field), derived... National Atlas of the United States.

22. Magnetic Field - Secular Variation of the Horizontal Component of the Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation) in the horizontal component of the total field intensity of the Earth's ... National Atlas of the United States.

23. Magnetic Field - Secular Variation of the Inclination Component for the Epoch 2010.0

2010. National Geophysical Data Center. This shapefile shows lines of equal annual change (secular variation) in the inclination of the Earth's magnetic field, derived from the Internatio... National Atlas of the United States.

24. Magnetic Field - Secular Variation of the Total Field Component for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation), in the total field intensity of the Earth's magnetic field, derived fro... National Atlas of the United States.

25. Magnetic Field - Secular Variation of the Vertical Component of the Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation) in the vertical component of the total field intensity of the Earth's ma... National Atlas of the United States.

26. Magnetic Field - Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This shapefile contains isodynamic lines (lines of equal total intensity of the Earth's magnetic field), derived from the International Geomagnetic... National Atlas of the United States.

27. Magnetic Field - Vertical Component of the Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal vertical intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Fie... National Atlas of the United States.

28. Map of solar energy in the United States and southern Canada.

Enmap Corporation. Enmap Corp.,.

29. Map Of The United States, Canada, Mexico, Central America, and the West India Islands With a Portion of Venezuela & New Granada; Showing the routes overland and by the Isthmus to California and Oregon, Also the new Boundaries of California, Utah, & New Mexico, Compiled from the latest Authorities. Engraved & Published By J.M. Atwood, No. 19 Beekman Street, New York. 1851. D. McLellan, Printr. Spruce St ... Entered ... 1851, by J.M. Atwood ... New York. (Raster Image)

1851. Center for Spatial and Textual Analysis. This layer is a georeferenced raster image of a map of the United States, Canada, Mexico, Central America, and the West India Islands, with portion... Stanford Digital Repository.

30. Map of the United States in North America : with the British, French and Spanish dominions adjoining, according to the treaty of 1783

Kitchin, Thomas, d. 1784. Relief shown pictorially. "May 1, 1783." Prime meridian: Ferro. From: A philosophical and political history of the settlements and trade of the Eur... [London] : T. Cadell, 1783.

31. Miscellaneous investigations series /

The Survey :.

32. N. American natural gas system

Frank, Claude. Platts,.

33. North America from the French of Mr. d'Anville improved with the English surveys made since the peace

Anville, Jean Baptiste Bourguignon d', 1697-1782. Relief shown pictorially. Shows area east of Louisiana. From: The American atlas, or, A geographical description of the whole continent of America ... London : Robt. Sayer & J. Bennett, no. 53 Fleet Street, 10 June 1775.

34. North American Atlas - Bathymetry (Lines)

2004. Instituto Nacional de Estadística, Geografía e Informática (Mexico), Canada Centre for Mapping, and Geological Survey (U.S.). This line shapefile shows bathymetric contours with depth in metres for ocean areas covered by the extent of the North American Atlas project. Isob... Canada Centre for Mapping.

35. North American Bat Ranges, 1830-2008

1830. National Atlas of the United States. This poygon shapefile portrays the distributions of United States and Canadian bat species during the past 100-150 years (1830-2009). The specimen ... National Atlas of the United States.

36. Paleogeography of northern North America

Dyke, Arthur S. Geological Survey of Canada,.

37. Political Boundaries, 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 depicts the political boundaries of North America, including: international boundaries, provincial boundaries, state or terr... Geological Survey (U.S.).

38. Political Boundary 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 depicts the political boundaries of North America, including: international boundaries, provincial boundaries, state or territo... Geological Survey (U.S.).

39. Populated Places, North America. 2004

2004. Geological Survey (U.S.), Instituto Nacional de Estadística, Geografía e Informática (Mexico), and Canada Centre for Remote Sensing. A joint venture involving the National Atlas programs in Canada (Natural Resources Canada), Mexico (Instituto Nacional de Estadística Geografía e I... Geological Survey (U.S.).

40. Roads, 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 represents roads in North America at 1:1,000,000 scale. The roads included in this layer are either those that connect major ce... Geological Survey (U.S.).