Distribution of the magnetic declination in the United States for January 1, 1910
Subtitle: with isogonic chart and secular change tables.
Series: United States Coast and Geodetic Survey : special publication -- 9; United States Coast and Geodetic Survey -- 9.
Publisher: Government printing office
Published: 1911
Place of publication: Washington
Language: eng
Number of pages: 14
Subjects: Geomagnetism.