Physics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990yamc.2142q.....&link_type=abstract
Yamamoto Circ., No. 2142,
Physics
Sunspot Numbers
Scientific paper
Sunspot numbers for Jan - May 1990 are given in Nos. 2144, 2146, 2147 -
2149.
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