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| Date: | 1906 |
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| Description: | The monoplane glider built and flown by Carl S. Bates of Clear Lake, Iowa. During the previous year Bates had built a bi-plane glider. |
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| Description: | A young man poses in front of a Natural History exhibit which includes a glass case of shells, butterflies and moths mounted on the wall. He donated his co... |
| Date: | 1916 |
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| Description: | Men work at tables in the Corn Testing Station conducted by Black Hawk County Crop Improvement Association. Corn cobs are held in wire storage racks along ... |
| Date: | 1916 |
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| Description: | Group of men working inside a large room with samples of corn. Original caption: "Several hundred bushels were given six kernels every ear test, the averag... |
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