A few nice photo letters images I found:
Letter from George Jones to James G. Blaine Recommending Frederick Douglass as United States Minister to Haiti, 07/02/1889 (page 3 of 6)
Image by The U.S. National Archives
Title: Letter from George Jones to James G. Blaine Recommending Frederick Douglass as United States Minister to Haiti, 07/02/1889
From: Record Group/Collection: 59
Record Hierarchy Level: Item
Reference Unit: National Archives at College Park Reference Section
Persistent URL: arcweb.archives.gov/arc/action/ExternalIdSearch?id=594982
Repository Contact Information: Archives II Reference Section (Civilian), Textual Archives Services Division (Archives II Reference Section), National Archives at College Park, 8601 Adelphi Road, College Park, MD, 20740-6001.
Reproductions may be ordered via an independent vendor. NARA maintains a list of vendors at www.archives.gov/research/order/vendors-photos-maps-dc.html
Access Restrictions: Unrestricted
Use Restrictions: Unrestricted