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Maryland Geological Survey, Volume 1, 1897
Volume 423, Page 496   View pdf image (33K)
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496 FIRST REPORT UPON MAGNETIC WORK

so as to run magnetically east and west, beginning at the east end and
supposing that the surveyor did not come across any areas of local

FIG. 7.—Secular variation in the position of the agonic curve of North America
between A. D. 1700 and 1900, according to C. A. Schott.

attraction, the boundary as mapped out by the compass would be
the line indicated on the map (Plate XVII). It will be seen that


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Maryland Geological Survey, Volume 1, 1897
Volume 423, Page 496   View pdf image (33K)
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