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pubs.usgs.govunited states department of the interior geological survey f f x 4620 —0.65 explanation 65 85 s 85 approximate mean declination, 1963 80 f 80

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Page 1: pubs.usgs.govunited states department of the interior geological survey f f x 4620 —0.65 explanation 65 85 s 85 approximate mean declination, 1963 80 f 80