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| Date: | 1972 |
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| Description: | Political scientist Samuel L. Popkin and his wife. This photograph was taken about the time Wisconsin-born Popkin was jailed for his refusal to testify abo... |
| 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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