Principal facts of the earth's magnetism and methods of determining the true meridian and the magnetic declination 

 - Washington, D. C.  Department of U. S. Coast and Geoelectric Survey  1909 
 - 99p.  charts; diagrams; illus; plates; tables 
<br/><br/><label>ISBN: </label>1152034375 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth's Magnetic PolesMagnetic ChartsMagnetic ObservationsMagnetic SurveysVariations of Earth's Magnetism
<br/><br/><label>Universal Decimal Class. No.: </label>550.38  / USCGS