Excerpt from Terrestrial Magnetism: Results of Magnetic Observations Made by the United States Coast and Geodetic Survey in 1917
When in 1912 it was decided to confine the annual report of the Superintendent to administrative matters and to publish separately the scientific r... esults which had formerly appeared as appendices to the report, the time was deemed opportune to change from the fiscal year to the calendar year in the publication of the results of magnetic observations in the field. Accordingly, Special Publica tion No. 15 contained the results of observations made between July 1, 1911, and December 31, 1912, Special Publication No. 20 the results for the year 1913, Special Publication N o. 25 the results for the year 1914, Special Publication No. 36 the results for the year 1915, and Special Publication No. 42 the results for the year 1916.
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