Elaine Ingham, Neal Spackman, Matt Powers. 2019. Elaine Ingham, Part 2: From Barren Ground to Fertile Soil. Video. Sustainable Design Masterclass. Retrieved from youtube.com/watch?v=69sR8opXd8w.

From the video's description, “Learn from the world's foremost soil biologist Dr. Elaine Ingham, as she shows us how we can transform degraded, barren ground to fertile soil by repairing Soil Biology”. Ca. 3:20 in duration.