http://archive.org/details/selectedrecordso0132unit
Author: United States. National Archives and Records Service; United States. War Dept; United States. Office of Commissary General of Prisoners
Volume: Reel 0132 - SELECTED RECORDS OF THE WAR DEPARTMENT RELATING TO CONFEDERATE PRISONERS OF WAR 1861-65 - - 395 A.R. 3;277* Register of Deaths, Dec. 1863-June 1865 396 288 Stubs of Prisoners' Receipts, Apr. -May 1865 397 - Unidentified Index of Prisoners' Names and Barracks Numbers, [n.d.]

http://www.donslist.net/PGHLookups/GuidesM.htm
Confederate Prisoners of War (Record Group 109 - 145 Reels)
These microfilm records from the National Archives were placed on the Internet Archive by the Allen County Library Genealogy Center.
The finding guides were provided by DonsList.Net.