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BIBLIOGRAFÍA
(s.a) (2011) "Contaminación en la tierra" , consultado el 18 de Febrero del 2015, ULR: www.bioenciclopedia.com/contaminación-del-suelo.html?m=1
(S.a) (s.f) "Medio Ambiente", ULR: www.medioambiente.com/contaminación-de-tierra.html
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