Portada del libro.

https://books.google.es/books/content?id=wPY2AQAAIAAJ&printsec=frontcover&img=1&zoom=1&imgtk=AFLRE710RXbBAtiW7KyVP9zd8Y1dqqQd6GbXDULYsPKGn4fuYCAA3PXD6bsn48_u2Dwi8OuGsG_qnG-oOgz0MTO-9E0KcsYRhOdNV7Mh-ybYBD5ptY9EdrI