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| Date: | 1928 |
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| Description: | Crowd seated on the lawn of Agriculture Hall on the University of Wisconsin-Madison for a ceremony honoring S.M. Babcock, inventor of the butter test. |
| Date: | 1973 |
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| Description: | A man wearing a cowboy hat is operating an International Harvester model HT 340 experimental research tractor in a dirt arena under a tent in front of spec... |
| Date: | 1962 |
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| Description: | Elevated view of a crowd of men, teenagers, and children gathered around an International Harvester HT-340 experimental research tractor. |
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