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| Date: | 1920 |
|---|---|
| Description: | A man is operating an International 8-16 tractor around a wet area in a field at International Harvester's Hinsdale experimental farm. On the right is a tr... |
| Date: | 02 1977 |
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| Description: | A man is kneeling on the ice and snow at Potter's Lake. He is running a machine that is testing the oxygen levels in the water, while recording the results... |
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