Funny, I just found the same map on some Picasa album :
http://picasaweb.google.es/dmolinar/Pun ... 5411783810 Apparently the route was found by Ledormeur, famous pyreneist of the early 20th century. But hard to find some more description.
I wonder what do the dark double lines mean near the Barrancos. And do you know what kind of map it is ? For sure not the Alpina, I can't recognize it.