From a research standpoint this book is a tour de force. The authors have made liberal use of data culled from primary source materials found in many repositories including Massachusetts libraries and historical societies, Gettysburg National Military Park records, and literally hundreds of soldiers' military and pension records from the National Archives. There is a plethora of photographs and a number of outstanding fold-out maps sewn into the binding. With over 50 pages of endnotes and a detailed bibliography, any historian should be able to follow the paths of these researchers. The book, however, will also be of interest to general readers.