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diskettes sunspot

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NGDC/WDC for STP, Boulder-Indices of Solar Activity
Sunspot groups, Catania; (Jan 1978 - Dec 1987); 1 diskette Sunspot groups, Mt. Wilson (Jan 1962 - present); 1 diskette Sunspot groups, Greenwich (May 1874 - Dec 1981); 4 diskettes Sunspot groups, U.S. Air Force; (Dec 1981 - present); 3 diskettes Sunspot ...
www.ngdc.noaa.gov