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<http://bestenergies.com/downloads/naturemag_200604.pdf> <http://books.google.com/books?vid=ISBN3540007547&id=tH2fWtRevhcC&pg=PR9&lpg=PR9&ots=MkAitmLjky&dq=Amazonian+Dark+Earths:+Explorations+in+Space+and+Time&sig=ZoGihFbTyZihauOe8gPRnZpTV7g> <http://forums.hypography.com/terra-preta.html> <http://terrapreta.bioenergylists.org/> <http://web.archive.org/web/20110521085342/http:/members.aol.com/leanan7/preta.htm> <http://weblogs.madrimasd.org/universo/archive/2008/05/07/91198.aspx> <http://weblogs.madrimasd.org/universo/default.aspx> <http://www.GerhardBechtold.com/TP/gbtp.html> <http://www.biochar.org> <http://www.css.cornell.edu/faculty/lehmann/terra_preta/Book/TerraPreta_book_publication.htm> <http://www.eprida.com> <http://www.geo.uni-bayreuth.de/bodenkunde/terra_preta/> <http://www.lablaa.org/blaavirtual/publicacionesbanrep/bolmuseo/1983/bol14/bosep3.htm> <http://www.theatlantic.com/doc/200203/mann> <http://www.yurileveratto.com/articolo.php?Id=37>