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1.- EFFECT OF CLAY MINERALS AND ORGANIC MATTER ON THE CATION EXCHANGE CAPACITY OF SILT FRACTIONS
VERLAG CHEMIE; WEINHEIM; DEU; FEDERAL REPUBLIC OF GERMANY, 2000
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2.- SOIL DEGRADATION RELATED TO OVERGRAZING IN THE SEMI-ARID SOUTHERN CALDENAL AREA OF ARGENTINA
LIPPINCOTT, WILLIAMS & WILKINS COMPANY; BALTIMORE, MD; USA; UNITED STATES, 2001
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