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| Date: | 1966 |
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| Description: | Aerial view of International Harvester's Phoenix Proving Ground. Opened in 1947, the proving ground was used by International Harvester through the 1970's ... |
| Date: | |
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| Description: | A scientist leans over a microscope in the sewage treatment plant laboratory. Glass beakers and other tools and equipment are sitting on the counter. |
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