The selected titles in the African American Center's reference collection act as a gateway to the Library's overall collection; it is the tip of the iceberg of the Library's holdings related to African Americans and the African American experience. Some of the Center's materials are unique within the Library, but many titles - both reference and circulating - are also accessible elsewhere in the system. These general and reference-level materials meet the needs of the casual browser, college student and researcher. Emphasis is on the history, traditions and culture of Americans of African descent and of the African Diaspora worldwide. The collection is weeded based on significance of title, usage and maintaining existing collection strengths.