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| Date: | 07 1957 |
|---|---|
| Description: | Letter from Mrs. F.L. "Dixie" Larkin of Milwaukee, Wisconsin, to The Wisconsin Conservation Department regarding the use of DDT to control Dutch Elm Diseas... |
| Date: | 02 17 1928 |
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| Description: | Diagram of crossection and overhead view of a disk harrow. |
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