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• 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
  • License: No known copyright restrictions
  • 0 comments
  • 4 favorites
  • 9,839 views
  • Date taken: 1972-05
  • Date uploaded: 2012-05-07
  • Tags: nara:arcid=549062, usnationalarchives, environmentalprotectionagency, documerica
  • Visibility: public