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We present five decades of chromospheric activity measurements in 59 Sun-likestars as time series. These include and extend the 35 yr of stellarchromospheric activity observations by the Mount Wilson Survey (1966--2001),and continued observations at Keck by the California Planet Search (1996--).The Mount Wilson Survey was studied closely in 1995, and revealed periodicactivity cycles similar to the Sun's 11 yr cycle. The California Planet Searchprovides more than five decades of measurements, significantly improving ourunderstanding of these stars' activity behavior. We have curated the activitymeasurements in order to create contiguous time series, and have classified thestellar sample according to a predetermined system. We have analyzed 29 starswith periodic cycles using the Lomb-Scargle periodogram, and present best-fitsinusoids to their activity time series. We report the best-fit periods foreach cycling star, along with stellar parameters (T$_{eff}$, log(g), v$sin(i)$,etc.) for the entire sample. As a first application of these data, we offer apossible Maunder minimum candidate, HD 166620.

Five Decades of Chromospheric Activity in 59 Sun-like Stars and New Maunder Minimum Candidate HD 166620