Barcelona: Plaza & Janes, S. A., 1975. Cloth. First Edition; First Printing. 8vo; , 6-271,  pages. A charming first edition/first printing, olive green cloth, white and gilt stamped on... (Book #19937)
It's been heavily influenced by the Basque language, spoken in the North, and by Arabic thanks to the heavy Muslim presence in the southern parts of Spain. Modern Spanish further incorporates wors from other Romance languages, especially French and Italian.