A complete Serial Number Reference Manual for Caterpillar Auto Patrols and Motor Graders (1931 - 1961) . Contains date for S/N Start, S/N Stop, Year Manufactured, Size, Weight and Engine S/N Prefix along with other descriptors.   Engine information includes S/N Stop and Start, Year Manufactured, Horsepower and #Cyl - Bore X Stroke.

Also included are images of Auto Patrols and Motor Graders in Action.  (42 pgs-soft cover)