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Dear Ms. Holland,
Thank you for posting your question on History Hub!
We searched the National Archives Catalog for records relating to prisoners during the Civil War in the Records of the Provost Marshal General’s Bureau (Civil War) (Record Group 110). The search produced the following results. Please review the listing and contact the appropriate National Archives facility for access to the records you are interested in.
We also located an article from the Smithsonian Postal Museum about Keatinge & Bell.
We hope this information is helpful. Best of luck with your research!