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At least 22 globular clusters in our galaxy contain Cepheid variable stars. However, too many clusters and/or their Cepheids are poorly observed. This paper reports on three such clusters: NGC 6284, NGC 6293, and NGC 6333. Improved light curves and colors are determined for the Cepheids from CCD images. Membership of each of the Cepheids in the clusters is discussed. With these new data, the occurence of Cepheids in metal-poor clusters and the period-luminosity relation for Type II Cepheids are rediscussed.
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