To find books, DVDs, maps, sound recordings, manuscripts, and much more - everything except articles - use a library catalog.
OskiCat = most UC Berkeley libraries
MELVYL = all UC campus libraries, including all UC Berkeley libraries
What's the difference? more details here
For each item make sure you know the name of the physical library, call number, and whether or not it's checked out, library use only, etc.
Find Dissertations by searching Dissertations and Theses (Dissertation Abstracts) Full Text, which indexes graduate dissertations from over 1,000 North American, and selected European, graduate schools and universities from 1861 to the present. Dissertations published since 1980 include brief abstracts written by the authors and some feature 24-page excerpts. The database offers full text for most of the dissertations added since 1997 and some full text coverage for older graduate works.
Also see Find Dissertations and Theses for other specialized sources. Dissertations completed at UC Berkeley can be found in OskiCat, using the feature allowing you to limit to dissertations/theses: