Other sites to check out:

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National: International Harvester Collectors Club, Inc.

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Wisconsin Historical Society sites:
McCormick-International Harvester Company Collection

McCormick - International Harvester Collection - Images Collection 
( Search tractors, trucks or similar)

Art of the Draw 
Advertising posters from the McCormick - International Harvester Collection

Stonefield Village - Agricultural Museum

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CowBoard Online Tractor Fellowship 
2009 Red Power Roundup  Tractor Restoration Project

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