By Bill Vossler
Minnesota man adds rare Rockol tractor to his collection.
A brief history of the Lanz Bulldog tractor, which featured a 1-cylinder engine.
A rare trio of Heider tractors showcases the innovation of the Heider tractor line.
Tractor expert Bob Pripps traces the evolution of crawler tractor steering systems.
A reader finds a worn homemade tractor with a Model A Ford transmission outside of a barn.
Sam Moore runs across a Sears, Roebuck & Co. sales brochure advertising the Sears Handiman tractor line at an antique shop.
A rare Holt Caterpillar 2-Ton crawler marks the end of the era.
The Oliver 550 Utility took 14 months to rebuild and can be seen at the Central Washington Ag Museum.