Description and instructions for the use of 3-inch stokes trench mortar Mark I and shell, Mark I technical regulations Fortification : camouflage for artillery / prepared under direction of the Chief of Engineers technical regulations Fortification : explosives and demolitions / prepared under direction of the Chief of Engineers technical regulations Fortification : principles of field fortification / prepared under direction of the Chief of Engineers technical regulations Fortification : proctected shelters / prepared under direction of the Chief of Engineers technical regulations Fortification : standard types and execution of field fortifications / prepared under direction of the Chief of Engineers technical regulations Fortification : field fortification for artillery / prepared under direction of the Chief of Engineers technical bulletin / war department Electric wiring Army extension courses. Special text : Administration / prep. under the dir. of the Adjutant General for use with the Army Extension Courses Army extension courses. Special text : Mess management / prep. under the dir. of the Quartermaster General for use with the Army Extension Courses Army extension courses. Special text : Defensive combat and organization of the ground / prep. under the dir. of the Chief of Infantry for use … Army extension courses. Special text : Defensive combat and organization of the ground / prep. under the dir. of the Chief of Infantry for use …