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NGDC/WDC STP, Boulder-Sunspot Number Data via FTP from NGDC

ngdc.noaa.gov/stp/SOLAR/ftpsunspotnumber.html

̳: sun, data

NGDC/WDC STP, Boulder-Sunspot Number Data via FTP from NGDC

turt | sun - data

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I.UA, 20062024.
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