'The earth as a magnet', Harpers
Tags: 1900s; 1908; 1908-10-1; Black, F. A. (Frederick Alexander); Compass; Earth Sciences; Geography; Geomagnetism; Geophysics; Magnetic declination; Observations
'Terrestrial magnetism', Harpers
Tags: 1900s; 1906; 1906-6-1; Adams, Cyrus C. (Cyrus Cornelius); Discoveries in science; Earth Sciences; Geography; Geomagnetism; Geophysics; History; Magnetic declination; Observations; Secular variations
'The mariner�s compass', Harpers
Tags: 1900s; 1904; 1904-2-1; Compass; Earth Sciences; Geography; Geomagnetism; Geophysics; Newcomb, Simon
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