Principal facts of the earth's magnetism and methods of determining the true meridian and the magnetic declination
1909
Principal facts of the earth's magnetism and methods of determining the true meridian and the magnetic declination
U.S. Coast and Geodetic Survey
1909
Book digitized by Google from the library of University of Michigan and uploaded to the Internet Archive by user tpb. At head of title: Department of commerce and labor. Coast and geodetic survey. O. H. Tittmann, superintendent












