Berkeley 21

Number of measures per data source

	Reference  334 :    4 measures
	Reference  571 :    5 measures

References

 334

Friel E.D., Liu T, Janes K.A.

(1989) Publ. Astr. Soc. Pacific 101, 1105

Radial velocities of more old open clusters

1989PASP..101.1105F

 571

Yong D., Carney B.W., Texeira de Almeida M.L.

(2005) Astron. J. 130, 597

Elemental abundances ratios in stars of the outer galactic disk. I. Open clusters

2005AJ....130..597Y