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5. Magnetic Field - Secular Variation of the Horizontal Component of the Total Field Intensity for the Epoch 2010.0
8. Magnetic Field - Secular Variation of the Vertical Component of the Total Field Intensity for the Epoch 2010.0
2010. Geological Survey (U.S.). This polygon shapefile portrays the Public Land Surveys of the United States, including areas of private survey, donation land claims, and land gra... Geological Survey (U.S.).