Cornell resources:
Cornell Structural Soil – Structural soil was developed and patented by Cornell University to safely bear pavement loads after compaction and still allow root penetration and vigorous tree growth.
Structural Soil Part 1 and Structural Soil Part 2– Articles about CU-Structural Soil™ from ASLA Professional Practice Networks’ Blog
Journal articles – Technical papers on soil compaction and structural soil by researchers at Cornell’s Urban Horticulture Institute. See also journal articles on soil volume.