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I still wonder why they went out of business. Maybe they didn't pay enough in the way of bribes to politicians to get a bail-out?
One problem was that they were often sold at the same location as the tractors and 18 wheelers. A little off the beaten path.
There is a good, though hard to find, book on the subject: A Corporate Tragedy: the Agony of International Harvester by Barbara Marsh.
There are a bunch out there (Amazon), just a tad pricey...