From the Sustainable design masterclass (← Check that one out, its awesome!)
Elaine Ingham Restoring Soil Biology, Increasing Yields and Reducing Costs
https://www.youtube.com/watch?v=pk14Qyulc9E
Elaine Ingham Part 2 From Barren Ground to Fertile Soil The Sustainable Design Masterclass
https://www.youtube.com/watch?v=69sR8opXd8w
The Profits In Your Soil Reaching New Levels of Fertility on Farms, Pastures, and Special Crops.
https://www.youtube.com/watch?v=gbGrxoJO2zY&t=4658s
Elaine at Permacuture Voices
https://www.youtube.com/watch?v=xzthQyMaQaQ&t=1s
Peter McCoy specifically outlines how we can work with fungi and soil