American Farm Tractors in The 1960s - Chester Peterson, Jr., Rod Beemer - Google Books

https://books.google.de/books?id=HRez5fNucfAC&pg=PA92#v=onepage

Spin up the turbo, lock it into all-wheel drive, and shift into high gear to take a high-horsepower tour of the tractors of the 1960s! American Farm Tractors in the 1960s discusses and explores the history of John Deere and other prominent manufacturers…