Over 8,000 articles by top scholars that focus on the lives and events which have shaped African American history and culture. Also includes images and primary sources. (NVCC)
This collection offers roughly 1,400 fully searchable printed works, books, pamphlets, and speeches from the end of the Civil War to the beginning of Jim Crow. It includes documents related to African Americans and citizenship, voting rights, literacy, land rights, employment, and more, including the gaps between written law and practice. (VIVA)
This collection offers +1,000 fully searchable books, pamphlets, and speeches from the beginning of Jim Crow to post-World War I that provide insights into African American culture and life during this period of segregation and disenfranchisement. Topics include African American identity, relationships with peoples of other nations, and literature. (VIVA)
In Google, search for "primary sources" and your topic.
You could also try "primary documents" or "digital collection" or "digital library" in addition to "primary sources".
Search Tip:
Use words that would have been used during the time period you're researching. For example, African American was not always used. The language in documents in previous times may have included Negro or black.