Physics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990bavso..46q.....&link_type=abstract
Sol. Bull. (AAVSO), Vol. 46, No. 1, 2 p.
Physics
Sunspot Numbers
Scientific paper
Sunspot numbers for Feb - Jun 1990 are given in Nos. 2 - 6 (Feb - Jun
1990).
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