The 143rd Pennsylvania Regiment
History of Pennsylvania Volunteers volume 4
by Samuel P. Bates 1870

This regiment along with the 121 PA, 142 PA, 149 PA and the 150th PA were all veterans of the Battle of Gettysburg having formerly served in the First Corps. (Chamberlain was in the 5th) Though Chamberlain would command them for less than two weeks they would have a life long love for him. Even though they did not fight together at Gettysburg he was often invited to their reunions and even gave speeches. See Unveiling Ceremonies Equestrian Statue of Major General John F. Reynolds and Many Mementoes and Treasures of Gen. Chamberlain

There does not appear to be a full length history written for this regiment, However Patrick DeLacy, Commanding Company A recorded a very in depth account of Petersburg. See Patrick DeLacy's Petersburg Account

Other places to view online:
books.google.com
archive.org