Berkeley 66

Number of stars per data source

	Reference  117 : 1398 stars
	Reference  146 :  444 stars

117: Phelps R.L., Janes K.A.; (1996) Astron. J. 111, 1604; The old open cluster, Berkeley 66; 1996AJ....111.1604P
146: Guarnieri M.D., Carraro G.; (1997) Astron. Astrophys. Suppl. 121, 451; VI photometry of the galactic cluster Berkeley 66; 1997A&AS..121..451G