NGC 3228

Number of stars per data source

	Reference  101 :   13 stars
	Reference  999 :    8 stars
	Reference 1003 :   13 stars

101: Hartoog M.R.; (1976) Astrophys. J. 205, 807; The frequency of peculiar A and metallic-line stars in open clusters; 1976ApJ...205..807H
999: Houk N., Cowley A.P., Smith-Moore M.; University of Michigan (Ann Arbor) Vol 1 (1975), Vol 2 (1978), Vol 3 (1982), Vol 4 (1988), Vol 5 (1999); The University of Michigan Catalogue of two-dimensional Spectral Types for the HD stars; 1975mctd.book.....H
1003: Wooden W.H. II; (1971) Publ. Warner and Swasey Obs. 1 no 2; Space distribution of stars in the southern Milky Way: II. A region in Vela; 1971PW&SO...1b...1W