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![](./images/clear.gif) 1.- Characterization of peatland soils from the High Andes through (super 13) C nuclear magnetic resonance spectroscopy
Soil Science Society of America; Madison, WI; USA; United States, 2013
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![](./images/clear.gif) 2.- PROPERTIES OF BLACK SOIL HUMIC ACIDS FROM HIGH ALTITUDE ROCKY COMPLEXES IN BRAZIL
ELSEVIER; AMSTERDAM; NLD; NETHERLANDS, 2005
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![](./images/clear.gif) 3.- Spectroscopy characterization of humic acids isolated form Amazonian dark earth soils (terra preta de Indio)
Springer;; III; International, 2009
Amazonian dark earths; Wim Sombroek's vision
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