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Subject
Geomagnetism
8
Geoscientific Information
8
Transportation
4
transportation
4
Inland Waters
2
Magnetic declination
2
inlandWaters
2
structure
2
Administrative and political divisions
1
Aqueducts
1
Boundaries
1
Coasts
1
Dams
1
Geomagnetism--Secular variations
1
Oceans
1
Railroads
1
Rivers
1
Roads
1
Trails
1
boundaries
1