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1954ApJ...120..506M - Astrophys. J., 120, 506-508 (1954)
Spectral classification with exceedingly low dispersion.
MORGAN W.W., MEINEL A.B. and JOHNSON H.M.
Journal keyword(s):
Nomenclature: Fig. 5: Schulte NNA (Nos 13-19) = [MM53] Cyg OB2 NNA (Nos 13-19) added.
Simbad objects: 32
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