The tipping point (revisited): 92K (2)
I saw this from 1987, when I followed his link: “This comprehensive model of soil genesis is based on the observation that soils (S) evolve along two coacting pathways: progressive (P) and regressive (R).” I asked: Are you claiming that claims about soil genesis = a model? Andrew Jones: You read about a model of … The tipping point (revisited): 92K (2)