Sax Rohmer, El Diabolico Doctor (Biblioteca Oro, 35, 1935) 

It was not long before  a Spanish publisher introduced the  1920’s fashion of Yellow Crime Fiction booklets to Spain.  Only a few years after Mondadori in Italy,  the Barcelona publisher Molino proposed in 1933 (the year of the publishing house’s creation),  a series of Crime Fiction  pulps with yellow covers in its series Biblioteca Oro. Like the Italian series, this Spanish counterpart would become a landmark series, publishing the most representative authors in the genre.  The books were on average some 100 pages long and cost 0,90 cts.

 The first period of the series starts in 1933 and finishes in 1936, the year of the civil war.  In its original period, the series published 25 authors, accounting for 68 books (see list below).  The authors who saw the most of their books translated  in the series were Oppenheim (8), Martyn (7), Christie (6) and Van Dine (5).  Christie published there in that period the following books, whose translated title remain close to the original    (this was not always the case in French)  as can be see here :

El Asesinato De Rogelio Akroyd (Biblioteca Oro, 12, 1934 )
La Muerte De Lord Edgware ( Biblioteca Oro, 23, 1934 )
El Misterio Del Tren Azul ( Biblioteca Oro, 28, 1934 )
Tragedia En Tres Actos (Biblioteca Oro, 38, 1935) 
El Misterio De Sittaford (Biblioteca Oro, 47, 1935 )
Muerte En Las Nubes (Biblioteca Oro, 61, 1936) 

El Asesinato De Rogelio Akroyd ( Biblioteca Oro, 12, 1934 ),  translation G.Bernard de Ferrer, illustrations   B. Sch., 91 pp.

El Misterio De Sittaford (Biblioteca Oro, 47, 1935 ), translation Jose Maria Alvarez, Illustration de Jaime Tomas

S.S.Van Dine, El dragon del estanque (Philo Vance), Biblioteca Oro, serie Amarilla numero III-6,  1934

In the years following 1936 Editorial Molino restarted the series in different forms, at different prices and with slightly different  lettering (in blue) and editorial choices (a less strict focus on Crime Fiction, with Adventure novels published there too) but still with yellow covers.  It would prove an  enduring success, especially  for the series published between 1945 and 1956.

       

Further reading and sources :

.http://lozanoolivares.blogspot.co.uk/2012/10/biblioteca-oro-banda-amarilla-editorial.html

http://acotacionesdeunlector.blogspot.co.uk/2009/04/coleccion-amarilla-de-la-editorial.html