{"title": "Los guardianes de piedra (Ulysses Moore #5)", "key": "/works/OL17188141W", "authors": [{"author": {"key": "/authors/OL1426707A"}, "type": {"key": "/type/author_role"}}], "type": {"key": "/type/work"}, "subjects": ["Space and time", "Juvenile fiction", "Twins", "Brothers and sisters", "Adventure stories", "Fiction", "Adventure and adventurers", "Mystery and detective stories", "Spanish language materials"], "covers": [7360350, 8772099, 12505245, 12505920, 13944106], "description": {"type": "/type/text", "value": "aka \"The Stone Guardians\" in English."}, "series": [{"series": {"key": "/series/OL337946L"}, "position": "5"}], "latest_revision": 6, "revision": 6, "created": {"type": "/type/datetime", "value": "2015-08-07T11:09:40.591884"}, "last_modified": {"type": "/type/datetime", "value": "2026-06-13T14:26:06.309983"}}