You can find reports and other 'grey literature' using many of the databases listed in the Articles tab. Here are some other sources for government publications:
UC Library Search is the University of California’s unified discovery and borrowing system.
Access it directly or from the Library's homepage to find most UC books, articles, media, archival collections, and more.
You can also:
See the UC Library Search user guide and ask for research help 24/7 for more information.