Differense between old and new versions are explaned at World Data Center for the production,
preservation and dissemination of the international sunspot number:
Time span 1963-01-01 - 2015-05-31
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If you have any questions/comments about FTPBrowser contact:
Dr. Natalia Papitashvili,
National Space Science Data Center, Mail Code 672,
NASA/Goddard Space Flight Center, Greenbelt, MD 20771|