“Organization of Regiments and Companies of the Volunteer Armies of the United States”.  Dated Adjutant General’s Office, Washington, September 6, 1862. 4pp., measuring 7.25 x 5.25”. Details of the specific numbers and the allowable ranks of Union regiments of infantry [ten companies, cavalry [twelve troops], and artillery [twelve batteries]. Handy and concise, an excellent collectible.