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• Foresters chip base of trees to inspect cambium (a protective layer between bark and inner wood). If this is damaged, tree cannot survive and will be marked to cut, September 1973

  • Uploaded by: U.S. National Archives
  • License: No known copyright restrictions
  • 0 comments
  • 4 favorites
  • 7,265 views
  • Date taken: 1973-09
  • Date uploaded: 2012-05-07
  • Tags: nara:arcid=553635, usnationalarchives, environmentalprotectionagency, documerica
  • Visibility: public