Descriptions of the information and cultural resource centers established by the Los Angeles County (California) Public Library to serve four ethnic populations--American Indians, Asian Pacifics, Blacks, and Chicanos--are presented in this document. Information provided for each individual center includes its history, policies, collection, services, programs, location, and hours of service. It is pointed out that the collection of each center consists of materials relating to the ethnic community for which it is a resource; and that each center serves the general public and also serves as a reference and resource center for the 91 community libraries within the Los Angeles County Public Library system. (Author/CGD)