TY  - BOOK
ED  - U. S. Coast and Geodetic Survey
TI  - Principal facts of the earth's magnetism and methods of determining the true meridian and the magnetic declination
SN  - 1152034375
PY  - 1909///
CY  - Washington, D. C.
PB  - Department of U. S. Coast and Geoelectric Survey
KW  - Earth's Magnetic PolesMagnetic ChartsMagnetic ObservationsMagnetic SurveysVariations of Earth's Magnetism
ER  -