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![](./images/clear.gif) 1.- Indigenous knowledge about terra preta formation
Springer;; III; International, 2009
Amazonian dark earths; Wim Sombroek's vision
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![](./images/clear.gif) 2.- Organic geochemical evaluation of organic acids to assess anthropogenic soil deposits of central Amazon, Brazil
Elsevier;; III; International, 2013
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