Judy Yung, 74, a librarian for the Chinatown branch of San Francisco Public Library and the Asian branch of Oakland (Calif.) Public Library, died December 14. After her library career, she entered academia, establishing the Asian American Studies program at University of California, Santa Cruz. She wrote 10 books on Asian American history and studies and the experiences of Chinese immigrants and was a pioneer in the development of Asian language collections in American public libraries.