Classic Machines TractorsClassic Machines: The Allis-Chalmers HD-11 tractorCharles FairbairnJuly 11, 2016August 18, 2017 by Charles FairbairnJuly 11, 2016August 18, 2017 Designed as a replacement for an earlier tractor, the Allis-Chalmers HD-11 was a very worthy successor and was in production for over 25 years. By
