editors, J.M. Bigham and E.J. Ciolkosz ; organizing committee, J.M. Bigham ; editor-in-chief SSSA, R.J. Luxmoore

Soil Science Society of America c1993 SSSA special publication no. 31

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sponsored by Divisions S-5 and S-9 of the Soil Science Society of America in Atlanta, GA, 1 Dec. 1987 ; editors, Neil E. Smeck and Edward J. Ciolkosz

Soil Science Society of America 1989 SSSA special publication no. 24

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