The earth's magnetism.

By Chapman, Sydney.
London | New York Methuen | Wiley 1951 .
127 p. 17 cm..

USGS/NGIC geomagnetic observatory data

Denver, Colo. U.S. Geological Survey, National Geomagnetic Information Center 1991 .
computer laser optical disks , Title from disk label. | Disk Characteristics: CD-ROM 4 3/4 in..

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The earth's magnetism.

USGS/NGIC geomagnetic observatory data