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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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  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…

• 

  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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