Most Civil War regimental histories (both classic and modern) have an abysmal record in the 'useful map' category. If a map is included at all, it is usually just a theater-wide one intended for general orientation. This issue aside, too many modern regimentals are also just glorified roster lists, with some general social and campaign information tossed in.
A couple recent publications have thankfully reversed this regrettable trend. Red Clay to Richmond: Trail Of The 35th Georgia Infantry Regiment, CSA (by John J. Fox) and Richard J. Miller's Harvard's Civil War: The History of the Twentieth Massachusetts Volunteer Infantry both include large numbers of tactical maps that place the subject regiment in the thick of the battle, allowing the reader to follow the action with a reasonably detailed knowledge of the area's terrain. In many cases, surrounding regiments are also indentified and placed on the maps, providing both context and a ready visual aid.
With these two books, military and social subject matter are given their full measure of importance. Readers interested in either or both will not feel neglected. Both publishers, Angle Valley Press and University Press of New England, should be commended for their roles in bringing such deeply researched, comprehensive, and wonderfully presented regimentals to the public.