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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.