Original 1949 [dated 5/49] Cummins H and NH Series Diesel Engines Operation and Maintenance Manual [Bulletin No. 6304]. This Owners Manual gives care and operation instructions for these Engines. It is is in good condition with minor wear, blemishing and soiling [see photos]. The cover is missing, the first page and a couple others are loose from staples. Very informative and useful tool for the Cummins Owner.