The paperback Series Colección Serie Negra Policial-Misterio (Black Series, Police Mystery) was published in Barcelona by a consortium of publishers (Barral, Tusquets, Península & Laia) between 1972 and 1976. It consisted of 60 classics of crime fiction, from, among others Poe, McCoy, Chandler, and Ruth Rendell. While American crime fiction is very well represented, and English writers a little less so, it is interesting to note that French authors actually form majority in the series. They range from Balzac, to Gaboriau, to Manchette (La Lunática en el Castillo), Klotz, Kassak and Raf Vallet.
The list of the 60 books published in the series (Ediciones de Bolsillo Serie Negra Policial) is available here :