All soldiers who served Pennsylvania in the Civil War have their names listed on this monument at Gettysburg, Pennsylvania.
Called simply the Pennsylvania State Monument, it is dedicated to all troops of Pennsylvania that fought on the battlefield, including my ancestors William Cowey and his brother Thomas Cowey, I believe. (I have not yet visited the monument and seen their names.) The bronze plaques around the base of the monument contain the names of all the Pennsylvanians who fought in battle.
If you are ever in the area, the monument is located on Cemetery Ridge, about half way between the town of Gettysburg and Little Round Top.
Go to this webpage to see a map of the area that saw action on day 3 of the Battle of Gettysburg (including the location of the Pennsylvania Monument). Here's a small version of the same map below. Notice the Pennsylvania Monument's image on the bottom right.