The Brazilian Agricultural Research Corporation	http://www.embrapa.br/english
Tropical America - Botany and conservation at Kew	http://www.kew.org/science/tropamerica/index.htm
Kew - Drylands: Tropical America	http://www.kew.org/science/directory/teams/DrylandsTropicalAmerica/index.html
WWF - Soya and the cerrado	http://wwf.org.uk/what_we_do/safeguarding_the_natural_world/forests/forest_conversion/cerrado.cfm
Catalog of Jimmy Ratter's cerrado collections	http://rbg-web2.rbge.org.uk/Ratter_labels