Date: | 1935 |
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Description: | Elevated exterior view of Yerkes Observatory. Geneva Lake is in the background, left. Roads and sidewalks cross the sweeping, well tended lawns. The desi... |
Date: | 1950 |
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Description: | Bird's-eye view of Yerkes Observatory. |
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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