National Geomagnetic Information Center U.S text cou Denver, Colo U.S. Geological Survey, National Geomagnetic Information Center 1991- 1989 9999 monographic Annual, with 5-year archival cumulations eng

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computer laser optical disks 4 3/4 in. computer disks (5 1/4 in.) + user manual Contains one-minute values of geomagnetic data from all magnetic observatories of the USGS network. The values are provided as 3-component vector data from a fluxgate magnetometer, as well as scalar data from a proton precession magnetometer. Title from disk label. Disk Characteristics: CD-ROM System requirements: IBM PC or compatible; EGA; VGA; presentation software GODIS written in C-language. Geomagnetism Observations CD-ROM CD-ROM Fed. Doc GIS 920109 20160527192745.0 197204