I have a copy of my ancestor, Andrew Park's journal "Some of my Recollections of the Battle of Gettysburg My wife has put it online for others to read. Here is the URL to read the story. I put it in the "Civil War Times" magazine, it was in the Aug. 2005 issue.
I hope this helps with your research.
R. B. Moore
http://rbmooreshistorygenealogy.blogspot.com/