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Filter: Creator Name of Tvedt, Dean
| 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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| 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. |
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