You searched for: Author National Geophysical Data Center Remove constraint Author: National Geophysical Data Center Publisher National Atlas of the United States Remove constraint Publisher: National Atlas of the United States Subject Geomagnetism Remove constraint Subject: Geomagnetism Subject Magnetic declination Remove constraint Subject: Magnetic declination Institution Stanford Remove constraint Institution: Stanford Place United States Remove constraint Place: United States Place Alaska Remove constraint Place: Alaska Place Connecticut Remove constraint Place: Connecticut Place Arizona Remove constraint Place: Arizona Format Shapefile Remove constraint Format: Shapefile
2010. National Geophysical Data Center. This map layer shows isogonic lines (lines of constant declination of the Earth's magnetic field), derived from the International Geomagnetic Refer... National Atlas of the United States.
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.