Sorry for the slow response. The anniversary of the Battle of Gettysburg has kept me very busy.
The "Information Obtained From" columns typically represent some kind of register or roll in which the soldier's name, rank and regiment were identified. I've stopped trying to interpret them but I've seen "C.P. Md" or "C.P." (Camp Parole, MD), "B.B." (Benton Barracks, MO), "CCO" (Camp Chase, OH), "O. An" (Original Andersonville List) and others. I believe that "M. R." is Muster Roll and "OR Ex" is "Official Record of Exchange" but I can't say that for sure. I've never seen a master list of the abbreviations.
The "Clo." at the bottom is the date in which his clothing account was settled with the government. Here's an example where it is spelled out more completely.
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