ENCYCLOPEDIA OF UNITED STATES ARMY INSIGNIA AND UNIFORMS , by William K. Emerson (University of Oklahoma Press, 676 pages, $125.00).

This thoroughly researched and well-documented book will undoubtedly prove an invaluable aid to researchers, collectors, and military historians in their efforts to identify uniforms and insignia of United States Army branches and individual units. The comprehensive work examines the dress of infantry, artillery, cavalry, and engineer units, as well as the insignia of affiliated groups such as the medical corps, military police, and the quartermaster corps, from 1782 to the present. More than two thousand photographs of individual insignia are complemented by pictures of the coats, shirts, and hats that they adorned. Each piece is intricately described, with a short history of its evolution also provided.