California fish and game biologist on the Colorado River regular checks are made of river's temperature, oxygen content salinity level, and fish content, May 1972
| Uploaded by | U.S. National Archives |
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| Views | 9,839 |
| Date taken | 1972-05 |
| Date uploaded | 2012-05-07 |
| Tags | nara:arcid=549062, usnationalarchives, environmentalprotectionagency, documerica |
| Visibility | public |