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![](./images/clear.gif) 1.- PEDOGENESIS OF VOLCANIC ASH SOILS IN ANDEAN ECUADOR
SOIL SCIENCE SOCIETY OF AMERICA; MADISON, WI; USA; UNITED STATES, 2003
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![](./images/clear.gif) 2.- Soil variations along a climatic gradient in an Andean agro-ecosystem
Elsevier; Amsterdam; NLD; Netherlands, 2006
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