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| Date: | 07 15 1952 |
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| Description: | Dr. Karl Paul Link, professor of biochemistry at the University of Wisconsin, right, is pictured with Dr. Mohan Singh, director of food preservations for t... |
| Date: | 1915 |
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| Description: | A group of students and a teacher are sitting at desks in a classroom while listening to a lesson on the dangers of house flies. Agricultural lecture chart... |
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