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1994AJ....107.1806M - Astron. J., 107, 1806-1813 (1994)
Berkeley 20: an unusual old open cluster.
MacMINN D., PHELPS R.L., JANES K.A. and FRIEL E.D.
Journal keyword(s):
Nomenclature: CL* Berkeley 20 MPJF NN N=42 among (Nos 5-54)
Simbad objects: 47
