HERBERTO HELDER - 1930-2015 Cobra HELDER, Herberto.- Cobra / Capa e o «hors-texte» de Carlos Ferreiro.- Porto: & etc. [edição do autor], 1977.- 79, [4] p.: 1 estampa; 18 cm.- B. Dedicatory of the author to Vasco Graça Moura, dated Nov. 1977. Specimen with numerous corrections by the Fist of Herberto Helder, confirming the idea of the author, according to which, being different all copies, because different corrections and amendments were introduced, the work would not be crystallized, before Remaining floating, exciting and suspended. In this regard, the letter of Herberto Helder addressed to Eduardo Prado Coelho, published in the magazine Abril, in February 1978, in which the poet raises not only these problems, but also others equally pertinent, as the question of what is Essential and what is accessory in the writing of the author, in these circumstances.