Hubble Space Telescope Observations of Globular Clusters in M31.I.Color- Magnitude Diagrams, Horizontal Branch Metallicity Dependence, and the Distance to M31
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T. Lauer | J. Holtzman | C. Grillmair | S. Faber | C. Lynds | W. A. Baum | E. Ajhar | J. Jr.O'NeilE.