Melvyl is a union catalog containing citations for the entire holdings of the ten UC campuses, the California State Library, Hastings College of the Law, the California Academy of Sciences, the California Historical Society, the Center of Research Libraries, the Graduate Theological Union, and the Lawrence Berkeley National Laboratory.
The advantage of using Melvyl is that it can display Chinese characters, while the UC Berkeley catalog GLADIS cannot.
The California Digital Library (CDL) provides access to digital materials that complement the existing print collections of the University of California. Of note is that the CDL includes a collection of e-books on subject: China.
Guide to CDL:
http://www.cdlib.org/ inside/ instruct/