Describes military posts in all regions of the U.S., including the Western territories, with details of their hospitals, barracks, etc. In a 1928 talk at Mayo Clinic historian Fielding Garrison wrote about this work, "From 1869 to 1874 he [Billings] was borrowed from the Army by the Secretary of the Treasury to study the different stations of the Marine Hospital Service....In pursuance of this end, he was in every important city or locality in the whole length and breadth of the United States....While on this detail he rendered to the Surgeon General two important and massive reports on the barracks, hospitals and hygienic condition of the army (1870-1875)" (Fielding Garrison, Billings: A Maker of American Medicine. Lectures on the History of Medicine. A Series of Lectures at the Mayo Foundation. (Philadelphia ,1933) 187-200. Digital facsimile from the Internet Archive at this link.