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1.- LASER DIFFRACTION GRAIN-SIZE CHARACTERISTICS OF ANDISOLS IN PERHUMID COSTA RICA; THE AGGREGATE SIZE OF ALLOPHANE ELSEVIER; AMSTERDAM; NLD; NETHERLANDS, 1997 Ver registro
2.- LASER GRAIN-SIZE DETERMINATION IN SOIL GENETIC STUDIES; 2, CLAY CONTENT, CLAY FORMATION, AND AGGREGATION IN SOME BRAZILIAN OXISOLS WILLIAMS & WILKINS COMPANY; BALTIMORE, MD; USA; UNITED STATES, 1997 Ver registro
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