{"subjects": ["English language, textbooks for foreign speakers", "English language", "Textbooks for foreign speakers", "Study and teaching (Elementary)", "Foreign speakers"], "key": "/works/OL7952725W", "title": "Backpack, Level 3", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL2653524A"}}], "type": {"key": "/type/work"}, "covers": [2322427], "latest_revision": 4, "revision": 4, "created": {"type": "/type/datetime", "value": "2009-12-10T22:14:59.472617"}, "last_modified": {"type": "/type/datetime", "value": "2022-04-03T04:38:44.563012"}}