You can google the name easily (better use the correct word: "venezuelan").

There are some Granado's works in Classicsonline.com, though not the etudes you mention.

I found this one in Myspace: "el Terco" (the stubborn). It may be one of the two you are looking for. This is the link: http://www.myspace.com/index.cfm?fuseaction=vids.individual&videoid=36037533