Pinto Ricardo, Rui. - Caracteristicas dos acidos humicos de alguns solas de Angola. Estudos, ensaios e documentos 87. Ministerio do Ultramar. Junta de Investigaçoes do Ultramar.

Lisboa, Ministerio do Ultramar, Junta de Investigaçoes do Ultramar, 1961,. 245x175mm, 89 páginas, encadernaç‹o de editor.

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