Letterman originated modern methods for medical organization in armies and on the battlefield. His system of organization enabled thousands of wounded men to be recovered and treated during the American Civil War. Digital facsimile from Google Books at this link.

Written by Woodward, Smart, Otis, and Huntington under the direction of Joseph K. Barnes, Surgeon General of the Army. This massive, graphically illustrated set has been called the “first comprehensive American medical book”. It is one of the most remarkable works ever published on military medicine. An index of operators and reporters appears at the end of the third surgical volume. This index makes it possible to look up any surgeon, and find the patients he treated. 

Woodward published an account of diarrhoea and dysentery in Pt.2, Vol. 1 (1879) pp. 1-869. Garrison considered this the greatest single monograph on dysentery. Woodward saw the Lösch amoeba, but without recognizing its significance.

Appendix to Part I, Containing Reports of Medical Directors, and Other Documents includes on pp. 92-104, LXXXII. Extracts from a Report of the Operations of the Medical Department of the Army of the Potomac from July 4th to December 31st, 1862. By JONATHAN LETTERMAN, Surgeon, U. S. Army, Medical Director of the Army of the Potomac. (Digital text of Letterman's report is available from U.S. Army Medical Department Office of Medical History at this link.