united states strategic bombing survey Hoesch A.G. Dortmund, Germany signal corps and air service : a study of their expansion in the United States 1917-1918 Rewards for service United States army : decorations, medals, service ribbons and A.E.F. insignia : together with interesting information regarding the army Drill regulations for signal troops Signal book United States army 1912 training manual / united states army Basic signal communication : students manual for all arms training manual / united states army Basic signal communication : instructors guide and all arms training manual / united states army Telephone switchboard operator : students manual for all arms Signal communication for all arms training manual / united states army Message center specialist : students manual for all arms : 1923 training manual / united states army field lineman : instructors guide for all arms training manual / united states army Telegraph operator : instructors guide for all arms : 1925
