American Civil War Armies 3: Specialist Troops/Philip Katcher, Ron Volstad. Osprey Men at Arms Series 179. Softcover. New edition 1994. Out of print. Condition: Very good. ISBN 085045722X
With two million men under arms, the US Army that had depended on just a minimal number of technical troops before the Civil War, now needed the support of almost an army of these alone. This book examines the organization and uniforms of the various specialists who served in the armies of both sides, including sharpshooters recruited for skirmishing duty, wounded men who would have been previously discharged, guarding important posts in the Veteran Reserve Corps and many civilians who wore the uniform of the Telegraph or Hospital Corps.