USGS/NGIC geomagnetic observatory data  [computer file]. 

 - Denver, Colo.  U.S. Geological Survey, National Geomagnetic Information Center  1991- 
 - computer laser optical disks  4 3/4 in.  computer disks (5 1/4 in.) + user manual 
 - 
 - 1985-1989- 
<br/><br/> Title from disk label.  Disk Characteristics: CD-ROM 
<br/><br/> 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. 
<br/><br/><br/>System requirements: IBM PC or compatible; EGA; VGA; presentation software GODIS written in C-language. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomagnetism--Observations--CD-ROM.<br/>CD-ROM Fed. Doc.