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We present the revised catalog of galaxy clusters detected as extended X-raysources in the 160 Square Degree ROSAT Survey, including spectroscopicredshifts and X-ray luminosities for 200 of the 201 members. The medianredshift is z~0.25 and the median X-ray luminosity is 4.2e+43 erg/s/h50^2(0.5-2.0 keV). This is the largest high-redshift sample of X-ray selectedclusters published to date. There are 73 objects at z>0.3 and 22 objects atz>0.5 drawn from a statistically complete flux-limited survey with a medianobject flux of 1.4d-13 erg/cm^2/s. We describe the optical follow-up of theseclusters with an emphasis on our spectroscopy which has yielded 155 clusterredshifts, 110 of which are presented here for the first time. Thesemeasurements combined with 45 from the literature and other sources providenear-complete spectroscopic coverage for our survey. We discuss the finaloptical identifications for the extended X-ray sources in the survey region andcompare our results to similar X-ray cluster searches.

The 160 Square DegreeROSATSurvey: The Revised Catalog of 201 Clusters with Spectroscopic Redshifts