Cordier Online. Cordier's classic index of works in Western languages on China, the Bibliotheca sinica is indexed online as part of the following site:
Bibliography of works on rare books available for consultation. Comprises over 600,000 pages of key out-of-print bibliographies that can be browsed online.
Indexes for Chinese (and other language) periodicals and articles published in Taiwan, Hong Kong and Macau periodicals from 1853 to current; updated each quarter.
