This is long and detailed report on the conditions and treatment of Southern Prisoners in the North.

Report of the Joint Committee of the Confederate Congress
Appointed to Investigate the Conditions*

*SOUTHERN HISTORICAL SOCIETY PAPERS
Vol. I. Richmond, Va., March, 1876.
No.3. March - Pages 132- 151

http://www.csa-dixie.com/csa/prisoners/t7.htm