Belgian archaeologist Louis Siret (also known as Luis Siret y Cels) was a pioneer of archaeology in Spain and the discoverer of the Chalcolithic and Bronze Age civilizations of Los Millares and El Argar in SE Iberia.
His original book Les premiers ages du metal dans le sud-est de l'Espagne (The early Metal Ages in the Southeast of Spain) has now been made available online, after restoration, by the Junta de Andalucía (Andalusian autonomous government). It can be accessed online at Archive.org in several formats including scanned facsimile. It is only available in French though.
Thanks to Pileta de Prehistoria.