He also worked on various hard cover books such as Gandhi, Lawrence of Arabia, The Jewish People and The History of Islam.
He would also work for Japanese company Kodansha, drawing the series 'Kami no Ude', as well as stories with Leslie Charteris' 'The Saint' for the Swedish market and 'Tarzan' for the German publishers Ehapa.
Due to his connections with Selecciones Ilustradas, Brocal joined American company Warren Publishing, as one of the first Spanish artists to work in their magazines, premiering in Eerie 34 in July 1971.
While at Warren he drew multiple recurring characters including 'Targos' and 'The Mummy', one of the first continuing series published in Eerie.
In 1991, together with Antonio Segura, he created the series El otro Necronomicón ("The Other Necronomicon") for the Spanish version of Creepy; it included seven short horror stories inspired by H. P. Lovecraft's world of creations.