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| Date: | 1899 |
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| Description: | A studio portrait of naturalist, conservationist, and writer John Muir. |
| Date: | |
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| Description: | Six-man crew at Camp Mercer looking for ribes (gooseberries), a stage essential for the transmission of blister rust to white pines, working in a marsh are... |
| Date: | 1966 |
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| Description: | Gaylord Nelson participates in a canoe trip down the Namekagon River in an effort to protect the river under the National Wild and Scenic Rivers Act. |
| Date: | 04 1970 |
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| Description: | Acting on the suggestion of his mentor Senator Gaylord Nelson, Wisconsin congressman David R. Obey participated (here at a gym) at the first Earth Day even... |
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