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| 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... |
| Date: | 1925 |
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| Description: | Limnologist Dr. Edward Birge (left) and Professor Chauncey Juday posing together outdoors at what is probably the lake research laboratory in Trout Lake. |
| Date: | 1922 |
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| Description: | View of an unidentified man sitting on a stool demonstrating delicate paper testing apparatus. A poster on the wall reads: "International Metric System." |
| Date: | 1922 |
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| Description: | Interior view of two unidentified male scientists working with various paper testing apparatus in the corner of a chemical laboratory. |
| Date: | 1922 |
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| Description: | View of an unidentified male scientist looking into boxed paper apparatus, surrounded by other measuring tools and scales, in the corner of a Kimberly Clar... |
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| Description: | View across street through chain-link fence towards a van labeled: "Department of Natural Resources Air Monitoring Laboratory." Behind the van and across a... |
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| Description: | Two men are helping to hold down a sturgeon on the side of a boat as a third man tags the dorsal fin. |
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| Description: | Two men are collecting northern pike spawn on Fox Lake. One man is standing and holding the pike's head, while the other is sitting in a chair with a conta... |
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| Description: | Close-up view of two men collecting northern pike spawn on Fox Lake. One man is standing and holding the pike's head, while the other man is sitting in a c... |
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| Description: | Two men wearing jumpsuits and hard hats are measuring a tree. One man is holding up a measuring tape across the width of the tree as the other man writes o... |
| Date: | 10 1978 |
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| Description: | Two men are standing on the rocky shoreline of the Sheboygan River. One man is holding a shovel in his right hand and a glass jar in his left hand. The oth... |
| Date: | 10 1978 |
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| Description: | Two men are kneeling on the ground. One man is holding a shovel while the other man is scooping dirt from the shovel into a glass jar. They are measuring P... |
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| Description: | A man wearing hip waders is standing in wetlands holding a collecting screen. He is collecting helgramites (a type of insect larva) to be used as bait for ... |
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| Description: | Two men are surveying dried out wetlands. A farm is in the distance. |
| Date: | 07 11 1924 |
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| Description: | Right side profile view of a man driving a tractor pulling an experimental weighted disk harrow. Buildings are in the background. |
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| Description: | Elevated view of two men in a chemistry lab with glass block walls. The men are standing in front of two different wet bench lab tables, and are working on... |
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| Description: | Slightly elevated view of men and women sitting around a table, sampling slices of Oscar Mayer meat products in the Oscar Mayer laboratory. A women in a lo... |
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| Description: | A man is weighing milk and taking a sample for testing in acid in butter fat, creamery, East Aurora, N.Y.., U.S.A." Lantern slide. |
| Date: | 05 29 1957 |
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| Description: | Dr. Theodore Schreiner, a research assistant from Tuebingen, West Germany (right), holds a cage while Laboratory Director Professor Arthur D. Hasler record... |
| Date: | 08 20 1957 |
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| Description: | Pierre du Vair, a June graduate from Notre Dame University, is shown working at his typewriter and tape recorder preparing for graduate study in economics ... |
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