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1990AJ.....99.1504A - Astron. J., 99, 1504-1535 (1990)
A CCD photometric analysis of the old open cluster NGC 2420.
ANTHONY-TWAROG B.J., KALUZNY J., SHARA M.M. and TWAROG B.
Journal keyword(s):
Simbad objects: 55
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