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  1. Magnetic Declination (Variation) | NCEI - National Oceanic and ...

  2. Magnetic Declination on Map

  3. Historical Declination Viewer - National Centers for Environmental ...

  4. Historical Magnetic Declination Viewer - National Centers for ...

  5. World Magnetic Model (WMM) | National Centers for …

  6. Magnetic Field Calculators - National Oceanic and Atmospheric ...

  7. Historical Magnetic Declination Viewer - Overview - ArcGIS

  8. Magnetic Declination, Models, Data and Services | NCEI

  9. Magnetic declination - NRCan

  10. SharedGeo Magnetic Declination Diagram Service