primary productivity: References & Edit History

Article Contributors

Primary Contributors

• The Editors of Encyclopaedia Britannica
  Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

Other Encyclopedia Britannica Contributors

• Gloria Lotha
• John P. Rafferty