Many libraries both in Chicago and beyond, have archives and manuscripts relevant to the study of race and education, especially those about Chicago. References in the secondary sources you read may point you to specific special collections. ArchivGrid, linked from this page, is a powerful tool to locate relevant archives and manuscripts. Also, by telephone or email, you can ask the curators at a special collection whether they have materials relevant to your topic.
Materials in a special collection are not always available for immediate use. If you decide to use materials in a special collection, arrange ahead of your visit for the materials to be ready when you arrive.
This page has links to selected special collections in Chicago as well.