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All curriculum for the Delphi Program has been thoroughly researched and developed at Delphi Schools in Sheridan, Oregon. Once a course is published in final form, it has undergone rigorous piloting and is available for broad distribution from Heron Books™, the publishing entity of Delphi Schools. Over 300 courses, covering all grade levels and every subject in the Delphi curriculum, have now been issued and more are being developed all the time.