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1.- CHARACTERISTICS OF HUMIC ACIDS OF SOME VENEZUELAN SOILS
ELSEVIER; AMSTERDAM; NLD; NETHERLANDS, 1998
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2.- PARTICULATE ORGANIC CARBON AND NITROGEN IN THE ORINOCO RIVER (VENEZUELA)
NIJHOFF/JUNK; DORDRECHT-BOSTON-LANCASTER; NLD; NETHERLANDS, 1995
INTERNATIONAL SYMPOSIUM ON ENVIRONMENTAL BIOGEOCHEMISTRY (ISEB)
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