Para saber mas!!!!!

libros:

http://books.google.com.mx/books?id=rnNz8imHSaYC&printsec=frontcover&dq=el+salvador&hl=es-419&sa=X&ei=oh-WUtnOCcKmkQfm24HQCg&ved=0CC0Q6AEwAA#v=onepage&q=el%20salvador&f=false

http://books.google.com.mx/books?id=un6kGui8z4QC&printsec=frontcover&dq=el+salvador&hl=es-419&sa=X&ei=oh-WUtnOCcKmkQfm24HQCg&ved=0CF0Q6AEwCQ#v=onepage&q=el%20salvador&f=false

https://www.google.com.mx/search?q=el+salvador+&oq=el+salvador+&sourceid=chrome&espv=210&es_sm=91&ie=UTF-8#es_sm=91&espv=210&q=el+salvador&tbm=nws