Principal facts of the earth's magnetism and methods of determining the true meridian and the magnetic declination.
By: <Reprinted from United States magnetic declination tables and isogonic charts for 1902>
Publisher: Govt. print. off.
Published: 1909
Place of publication: Washington
Language: eng
Number of pages: 99
Subjects: Geomagnetism
Notes: At head of title: Department of commerce and labor. Coast and geodetic survey. O. H. Tittmann, superintendent.