Online collection of photographs related to the 1921 Tulsa Race Massacre. Curated by I. Marc Carlson, the former Librarian of Special Collections at the University of Tulsa's McFarlin Library. 
1921 Tulsa Race Massacre Online Exhibit from the Museum of Tulsa History. The online exhibit includes photos, audio recordings, documents, and resources for further research. 
The Tribal Treaties Database provides an easy-to-use portal to access treaties, agreements, and other historical documents that have shaped relationships between tribal nations and the United States. These treaties represent pivotal moments in history where rights were negotiated, promises made, and the course of lives and nations forever altered.
The Solomon Sir Jones films consist of 29 silent black and white films documenting African-American communities in Oklahoma from 1924 to 1928. Tulsa footage can be found in at least five of the films (film two, film eighteen, film twenty, film twenty-seven, and film twenty-eight) and includes several shots of the Greenwood area.
Digitized by the Oklahoma Department of Libraries, this collection includes 285 prisoner newsletters, dating from 1937 - 1973, written by inmates at the Oklahoma State Penitentiary and Oklahoma State Reformatory. 
The mission of the Oklahoma Historical Society is to collect, preserve, and share the history and culture of the state of Oklahoma and its people. The Oklahoma Historical Society (OHS) was founded on May 27, 1893, by members of the Territorial Press Association to preserve newspapers.
Oklahoma Digital Prairie provides visitors unique digital content spanning more than 100 years of rich, vibrant history from the 46th State. The resource areas include documents, photographs, newspapers, reports, pamphlets, posters, maps, and audio/visual content. Content ranges from the late 1800s to the present day.
ListenOK is a guide to oral history collections in Oklahoma. Notable collections include the Chilocco Indian Agricultural School Alumni Oral History Project, Phillips University Collection, and the Attucks School in Vinita collection. 
The Oklahoma Historical Society (OHS) has long believed that one important step toward ending racism and injustice is a better understanding of our shared history. By providing [free] resources that give context for the Black experience in Oklahoma, we hope to spark civil discourse and open dialogue about the role of race in the history of our state. While these conversations about our past may not be comfortable, they are necessary to understand where we have been and how we can best move forward together. - Description from the OHS website.