This is an ORIGINAL Allis-Chalmers HD11B Crawler Tractor Operating Instructions and Field Maintenance Manual.  (see pics for index and S/n range) This manual has super illustrations as well as having in-depth Operation, Maintenance and Specification Information on these Famous A/C tractors.  The covers of this manual are in GOOD overall condition. (see pics, normal wear and soiling) The spline is tight, intact, held firmly together with 2 staples however is starting to split towards the top.  The pages of this manual are super clean and in GOOD+ overall condition.  (see pics) This manual contains 55 pages full of information that cover these A/C tractors from A to Z.  (also includes a single page supplement) This is a great add to the collection for your A/C tractor. This manual will ship for FREE to the USA, International buyers to pay actual shipping cost.  Thanks for Viewing............................WhiteFarms1986