(click to enlarge)

The  Dendogram above represents all the authors published in the influential series Circulo del Crimen. This Spanish series (Forum) published between 1982 and 1986, tended as a rule to only publish one book by author, and only exceptionally two (Simenon, Ed Lacy, Himes) and in the sole cases of McBain and Irish three volumes. As a result, it offered a broad and excellent overview on the Crime genre, showcasing its most important authors (at least from England, the USA, and, to an extent, France), represented by some of their best work.