Curious about Hart-Parr, Oliver or White tractors? Follow the amazing history of Hart-Parr, from the beginning with the building of the first gasoline traction engine through the merger which created the Oliver Farm Equipment Company in 1929, and then the purchase of that company by White Motor Company in 1960. Watch the tractor line evolve with each turn of a page. Appendix provides Nebraska Tractor Test results and serial numbers.