Schott, Charles A.  <br/><br/>
Secular variation of the magnetic declination in the United States and at some foreign stations 
Charles A. Schott 
 - 7th ed. 
 - Washington, D. C.  US Coast and Geodetic Survey  1890 
 -  illus 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Secular VariationMagnetic Declination
<br/><br/><label>Universal Decimal Class. No.: </label>550.3  / SCH