professional papers of the corps of engineers, u.s. army Report upon experiments and investigations to develop a system of submarine mines for defending the harbors of the United States / submitted to the Board … bulletin Papers by officers of the medical corps, U.S. Army, read before the fifteenth international congress on hygiene and demography packer : training manual U.S. army Preparing for War : the emergence of the modern U.S. Army, 1815-1917 / J.P. Clark American soldier : Set No. 1 American soldier American soldier Air-Force : official Service Journal of the U.S. Army Air Forces annual reports / war department Report of the Chief of Engineers U.S. Army