1. The health of our soils—toward sustainable agriculture in Canada,1995
2. Concepts of soil and pedology;Arnold,1983
3. Global soil change. Rept. of an IIASA-ISSS-UNEP task force on the role of soil in global change,1990
4. Man as a factor of soil formation;Bidwell;Soil Sci.,1965
5. Soil color,1993