Original source: Several from NARA; see description. Ancestry.com has searchable indexes; database results and some digitized images are available with a fee-based subscription. Free articles and helpful research materials.
Name index and images of registers for 67,000 people who opened accounts in the Freedman's Savings and Trust Company. This NARA microfilm publication M816 Registers of Depositors in Branches of the Freedman's Savings and Trust Company.