Date: | 1939 |
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Description: | Elevated view of men harvesting grain with a McCormick-Deering 12 foot experimental combine (harvester-thresher) pulled by a Farmall M tractor. There is a ... |
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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