This is an ORIGINAL Cummins “4BT3.9 & 6BT509″ Diesel Engines Shop, Repair, & 1991 & 1994 Certification Level Manual Nov. 1994 printing, covers ALL models, please see all pics. This manual contains super illustrations as well as having in-depth repair and certification level information for these classic Cummins engines. The cover is in good shape with a corner repair. Book is complete and solid. This manual contains over 500 clean pages and is in GOOD+ overall condition. FREE S & H.