These databases are accessible with a Library card.
International Bibliography of Theatre and Dance
Index (some full-text) of current periodicals (1980-present) including entertainment industry publications (such as Playbill) and some scholarly journals.
International Index for the Performing Arts
Coverage begins in 1864. Indexes major English-language journals and magazines in all areas of entertainment and the performing arts. Recent articles are full-text.
Cumulative index with almost 230,000 citations to articles from academic and popular film journals.
New York Times 1851-2003
The Times covered Yiddish theatre fairly extensively in the 1920s and 30s. This database is full-text.