Collinder 347

Number of stars per data source

	Reference  392 :    1 star
	Reference  461 :   20 stars

392: Crampton D., Georgelin Y.M., Georgelin Y.P.; (1978) Astron. Astrophys. 66, 1; First optical detection of W51 and observations of new HII regions and exciting stars; 1978A&A....66....1C
461: Moffat A.F.J., Vogt N.; (1975) Astron. Astrophys. Suppl. 20, 155; Southern open star clusters. VI. UBV Hbeta photometry of 18 clusters From Centaurus to Sagittarius; 1975A&AS...20..155M