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  The American Farm Tractor - Randy Leffingwell - Google Books

  https://books.google.de/books?id=TAgl0oeJfd4C&pg=PA134#v=onepage

  Original ads, historic design drawings, and factory photographs tell the definitive story of the tractor's development, mechanical innovations, groundbreaking designs, and company histories. Best-selling author Randy Leffingwell researched and photographed…

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  The American Farm Tractor - Randy Leffingwell - Google Books

  https://books.google.de/books?id=TAgl0oeJfd4C&pg=PA69#v=onepage

  Original ads, historic design drawings, and factory photographs tell the definitive story of the tractor's development, mechanical innovations, groundbreaking designs, and company histories. Best-selling author Randy Leffingwell researched and photographed…

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  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…

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  The American Farm Tractor - Randy Leffingwell - Google Books

  https://books.google.de/books?id=TAgl0oeJfd4C&pg=PA70#v=onepage

  Original ads, historic design drawings, and factory photographs tell the definitive story of the tractor's development, mechanical innovations, groundbreaking designs, and company histories. Best-selling author Randy Leffingwell researched and photographed…

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