Good news, a Christmas present from Spain, the Spanish Ministry of Culture and its online digital database of books on the Peninsular War. 228 different books.

http://bvpb.mcu.es/independencia/es/consulta/resultados_busqueda.cmd

Español; Castellano (142)
Francés (63)
Inglés (15)
Catalán (3)
Alemán (3)
Italiano (1)
Portugués (1)

Best regards and just only to say.... Enjoy!

Juan