Original World War II U.S. Army Ordnance School Text OS 9-31: Automotive Electricity For In-Line Engines, Second Edition, December 1942. Prepared by The Ordnance School, Aberdeen Proving Ground, Maryland. Stamped inside in blue: Headquarters 256th Ordnance Company (MM).
Big softcover book numbers 85 pages. Filled with instructions and illustrations.
Complete, shows some fading at top and some minor wear.