THE SPIRIT OF CATALONIA
Thanks to Vilaweb folks, you can read the original english version (1946) of the book The Sprit of Catalonia wrote by Dr. Josep Trueta, in a digital edition. Dr. J. Trueta was one of the most known personalities exiled from Catalonia after the 1936-39 War. For a short biography in English see his entry at Wikipedia.
The Spirit of Catalonia is one of the key books wrote during the dark years of the Franco's Regime, and it had an important influence in the Catalan Opposition. The author establishes a dichotomy: since the body of Catalonia is under Franco's boots, the Catalans must emphasize and protect the Catalan Heritage and let it know around the World.