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This paper discusses the galaxy populations of three rich clusters, withredshift 0.19 (0839+29), 0.24 (1231+15), and 0.32 (1224+20), from the databaseof the CNOC1 consortium. The data consist of spectra of 52 cluster members for0839+29, 30 members for 1224+15, and 82 members for 1231+15, and there arecomparable numbers of field galaxy spectra. 0839+29 is compact with no strongradial gradients, and possibly dusty. 1224+20 is isolated in redshift, has lowvelocity dispersion around the cD galaxy, and low 4000A break. 1231+15 isasymmetrical and we discuss the possibility that it may be a recent merger oftwo old clusters. We find few galaxies in 0839+29 and 1231+15 with ongoing orrecently truncated star-formation.Comment: 16 pages and 20 diagrams, to appear in A

Galaxy Population Properties in the Rich Clusters MS 0839.8+2938, MS 1224.7+2007, and MS 1231.3+1542