Advertisement21 more unmarked graves are discovered in the Tulsa Race Massacre investigationNovember 02, 2022Vanessa RomofacebookEmailScientists at the site in Tulsa, Okla., will begin excavating by hand, using finer grain tools to clean up the coffins. That will help researchers analyze the construction style and hardware of the caskets in order to determine when they were interred. (City of Tulsa)