{"title": "Correspondencia inedita de Unamuno", "subtitle": "Unamuno-Menendez Pidal, Delfina Molina a Unamuno", "publish_date": "1998", "publishers": ["Ediciones Escurialenses"], "languages": [{"key": "/languages/spa"}], "weight": "1.7 pounds", "isbn_13": ["9788489788060"], "covers": [4917283, 3713122], "physical_format": "Unknown Binding", "isbn_10": ["8489788065"], "type": {"key": "/type/edition"}, "subjects": ["Correspondence", "Menendez Pidal, Ramon", "Molina y Vedia de Bastianini, Delfina", "Unamuno, Miguel de"], "source_records": ["amazon:8489788065"], "key": "/books/OL9151999M", "number_of_pages": 181, "works": [{"key": "/works/OL19001708W"}], "latest_revision": 4, "revision": 4, "created": {"type": "/type/datetime", "value": "2008-04-30T09:38:13.731961"}, "last_modified": {"type": "/type/datetime", "value": "2026-01-21T00:24:51.680042"}}