To locate it, simply go to archive.org and type the full title in quotes: . You can also search by the Spanish phrase "casas vacías" combined with "península." Once you find the entry, you can read it directly in your browser or download it (if permitted) for offline reading.
For those interested in the subject matter, La península de las casas vacías is a significant contribution to the conversation about rural Spain. Unlike political manifestos about depopulation, Martínez de Pisón’s narrative is human-centric. He visits towns in Aragón, Soria, and the Pyrenees, speaking to the last inhabitants of ghost towns. The title itself is metaphorical, referring to the abundance of empty homes in the Spanish countryside—vestiges of a time when the rural population was much higher.
Go to Open Library and search for "La península de las casas vacías."