The Gettysburg photographs : a new approach -- The problems of documentation -- Gardner and his men -- Mathew Brady -- The Tyson brothers -- Additional photographers -- The Battle of Gettysburg -- The presentation -- Group I : the first day's field -- Group II : Cemetery Hill -- Group III : Culp's Hill -- Group IV : Little Round Top and Devils Den -- Group VI : The Rose Farm -- The early photographs : a plea for reappraisal.