Committee hearings are meetings of small groups of legislators who hear testimony on a bill. The U.S. Congress routinely publishes both committee hearings (print compilations of hearing transcripts and materials submitted to the committee) and committee reports (reports that are, at least nominally, authored by the committee itself, as opposed to bill analyses written by the committee staff.)
The California legislature only rarely publishes committee hearings and reports and tracking down the ones it has published can be difficult.
First, for bills passed from 1946 to 1970, check for committee reports in the appendices to the:
Finally, check lists of committee hearings, reports, and other government publications: