Methods & results: Secular variation of the magnetic declination in the United States & at some foreign stations

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<title> Methods & Results: Secular Variation Of The Magnetic Declination In The United States & At Some Foreign Stations

<edition> 6

<author> U.S. Coast and Geodetic Survey

<publisher> Govt. print. off., 1887

<subjects> Science; Geophysics; Science / Geophysics; Science / Magnetism