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1. 1 Profitable soil management / Leo L. Knuti, Milton Korpi, J. C. Hide
2. 2 The nature and properties of soils / Ray R. Weil, Nyle C. Brady : pbk
3. 3 Soils : an introduction to soils and plant growth / Roy L. Donahue, Raymond W. Miller, John C. Shickluna ; editorial assistant, Joyce U. Miller
4. 4 Soil nutrient bioavailability : a mechanistic approach / Stanley A. Barber
5. 5 Defining soil quality for a sustainable environment : proceedings of a symposium sponsored by Divisions S-3, S-6, and S-2 of the Soil Science Society of America, Division A-5 of the American Society of Agronomy, and the North Central Region Committee on Soil Organic Matter (NCR-59) in Minneapolis, MN, 4-5 November 1992 / editors, J.W. Doran ... [et al.] ; organizing committee, J.W. Doran, J.A.E. Molina, and R.F. Harris ; editor-in-chief SSSA, J.M. Bigham ; managing editor, Susan Ernst