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by Isbell, R. F.; National Committee on Soils and Terrain
by Krasilnikov,Pavel
by Eswaran, Hari; Ahrens, Robert; Rice, Thomas J.; et al.
by Fanning, Delvin Seymour; Fanning, Mary Christine Balluff
by Eswaran; Hari
by Krasilnikov, Pavel; Marti, Juan-jose Ibanez; Arnold, Richard; et al.
by Legros; Jean-Paul
by Buol, Stanley W.; Southard, Randal J.; Graham, Robert C.; et al.
by Guyer, J. Paul
by Shahid, Shabbir A.; Taha, Faisal K.; Abdelfattah, Mahmoud A.