Relevant records from Camp Morton have been carded and placed in Hulse's file. These were taken from M598, Selected Records of the War Department Relating to Confederate Prisoners of War, 1861–1865, 429 microfilm reels.

Cards will look much like the one on this NARA site:

http://www.archives.gov/publications/prologue/2001/winter/confederate-marines-in-the-civil-war.html

A book about this prison camp is available:

Camp Morton, 1861-1865: Indianapolis Prison Camp, Winslow, Hattie Lou and Moore, Joseph R.H. This is the fascinating story of the Union prison camp at Camp Morton at Indianapolis. A well researched and well documented history of the camp and life there. (1940, repr. 1995), 154pp., hardbound.

[Interior of Camp Morton]