Ensaio de Estruturaçao de Classes dos Niveis Hierarquicos de Categorias III e IV, Referentes as Classes 3, 8 e 11 do Nivel de Categoria I. Estudo Preparatorio para Futura 3a Aproximaçao do Desenvolvimento do Sistema.
Rio de Janeiro, Brasil. : Empresa Brasileira de Pesquisa Agropecuaria (EMBRAPA)
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