NGC 3228

Number of stars per data source

	Reference  345 :    1 star
	Reference  357 :    1 star

345: Olsen E.H.; (1983) Astron. Astrophys. Suppl. 54, 55; Four-colour ubvy and Hbeta photometry of A5 to G0 stars brighter than 8.3m; 1983A&AS...54...55O
357: Olsen E.H., Perry C.L.; (1984) Astron. Astrophys. Suppl. 56, 229; A catalogue of Hbeta photometry of southern A5 to G0 stars brighter than 8 m.3; 1984A&AS...56..229O