The Civil War in Philly and other places

My wife and I along with my son will be off to Philadelphia soon to visit my niece who is a graduate student at Villanova. While mostly known for its historical sites related to the Revolution I am hoping to steal a little time and get to the Civil War Museum. I am mostly interested in looking up a few things. I have been just uncovered a few possible leads on additional source material related to the First Maine Heavy Artillery. One of these leads is an article published by Zemro A. Smith in MOLLUS Papers for Indiana. I also have a lead on some Civil War and post war papers from another officer who lived in the Washington DC area but I am waiting to confirm. The other lead I am following up on is with the Gatchell Museum in Buffalo, Wyoming. This museum is actually named after Jim Gatchell the son of Prince A. Gatchell an officer in the First Maine Heavy Artillery. After the war Prince went out west and his son who grew up out there developed a life long interest in preserving the history of the Americas frontier. He also learned to speak Sioux and became a trusted friend amongst the local Native American tribes.