History of Pennsylvania volunteers, 1861-5

A very detailed history of each regiment, what it did on which dates, and who was in it, and who was killed or otherwise harmed. There are at least 5 VOLUMES of this book. They are all different. (I have also seen references to Volume 7...) Unfortunately, the Open Library lists these as EDITIONS (that is, as different printings of the same book). But they are not the same!!! I do not know how to fix this.