Cobb, R.
- HWA 3000-3800 series soils.
- HWA Decomposition.
- HWA Decomposition Project Initial Soils. 1999
- HWA ecosystem 3800-4000 series.
- HWA Ecosystem Soils 3000 Series. 2000
- HWA, 1400 Series Soils (air dry).
- HWA, 1600 Series Soils.
- HWA, 1800 Series Soils.
- HWA, 2000 Series Soils. 1999
- HWA, 2200 Series Soils. 2000
- HWA, 2400 Series Soils.