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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.
2007. Sacramento County GIS. Line representations of Streams and Rivers in the County of Sacramento. Sacramento Area Council of Governments.
2018. Calaveras County GIS. This dataset shows the Main Roads for Calaveras County, California. It was downloaded from https://opendata-calaveras-gis.opendata.arcgis.com/datas... Calaveras County GIS.
2018. Calaveras County GIS. This dataset shows the Main Roads (No Highways) for Calaveras County, California. It was downloaded from https://opendata-calaveras-gis.opendata.ar... Calaveras County GIS.
2018. Calaveras County GIS. This dataset shows the Main Towns for Calaveras County, California. It was downloaded from https://opendata-calaveras-gis.opendata.arcgis.com/datas... Calaveras County GIS.
1997. United States. National Imagery and Mapping Agency. This point shapefile represents the major airfields in Kenya. This data was used in Map 6.4 and Map 6.5 featured in Natures Benefits in Kenya: An A... United States. National Imagery and Mapping Agency.