NGC 3324

Number of stars per data source

	Reference  289 :    1 star
	Reference  303 :    2 stars
	Reference  999 :    2 stars

289: Herbst W.; (1975) Astron. J. 80, 212; R associations I. UBV photometry and MK spectroscopy of stars in southern reflection nebulae; 1975AJ.....80..212H
303: Walborn N.R.; (1982) Astron. J. 87, 1300; Two-dimensional spectral classification for O stars in the southern Milky Way; 1982AJ.....87.1300W
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