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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.
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.
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.
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.
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.

6. 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.
1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, and 2000. Schultz, Kenneth A. This polygon shapefile represents areas that were the subject of interstate territorial disputes between 1947 and 2000. The disputed areas referenc... Stanford Digital Repository.
Scale: 1:250000; Projection: transverse mercator; Relief Symbology: contours, form lines, spot heights; Map Type: Topographic maps.; Other Desc... United States. Army Map Service.
Scale: 1:250000; Projection: transverse mercator; Relief Symbology: contours, form lines, spot heights; Map Type: Topographic maps.; Other Desc... United States. Army Map Service.
Scale: 1:250000; Projection: transverse mercator; Relief Symbology: contours, form lines, spot heights; Map Type: Topographic maps.; Other Desc... United States. Army Map Service.