Addendum - High Resoultion CCD Spectra of Stars in Globular Clusters - Part Three - m4 M13 and M22 Wallerstein, G. ; Myckky-Leep, E. ; Oke, J. B. Abstract Publication: The Astronomical Journal Pub Date: August 1987 DOI: 10.1086/114491 Bibcode: 1987AJ.....94..523W