Columbia subject headings:
United States Naval Observatory--Buildings.
United States. Department of the Navy. Bureau of Medicine and Surgery--Buildings.
United States. Naval Medical Command--Buildings.
United States. Navy. Medical Department--Buildings.
Washington (D.C.)--Buildings, structures, etc.
Harvard subject headings:
United States Naval Observatory--History.
United States. Navy. Medical Department--History.
Washington (D.C.)--Buildings, structures, etc.
Princeton subject headings: