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Letter, dated Libby Prison, Richmond, Virginia, February 1 1864?, from Lieutenant Colonel Johnson, 15th Wisconsin Volunteer Infantry Regiment, to his brother, John A. Johnson; written in "invisible...
Letter, dated Libby Prison, Richmond, Virginia, February 1 1864?, from Lieutenant Colonel Johnson, 15th Wisconsin Volunteer Infantry Regiment, to his brother, John A. Johnson; written in "invisible ink" (probably onion juice) which could be seen only when heated, perhaps in an attempt to pass Confederate censorship.