US Army, Technical Manual, TM 5-2410-235-24P, TRACTOR, CRAWLER: DIESEL ENGINE DRIVEN FULL-TRACKED, LOW SPEED, AIR-TRANSPORTABLE JOHN DEERE MODEL 550 (NSN 2410-01-139-9859)
US Army, Technical Manual, TM 5-2410-235-24P, TRACTOR, CRAWLER: DIESEL ENGINE DRIVEN FULL-TRACKED, LOW SPEED, AIR-TRANSPORTABLE JOHN DEERE MODEL 550 (NSN 2410-01-139-9859)