{"id":"obr:work:back-to-the-stone-age","slug":"back-to-the-stone-age","url":"https://openbookrank.com/en/book/back-to-the-stone-age","urls":{"en":"https://openbookrank.com/en/book/back-to-the-stone-age","fr":"https://openbookrank.com/fr/livre/back-to-the-stone-age","it":"https://openbookrank.com/it/libro/back-to-the-stone-age"},"title":"Back to the Stone Age","titles":{"es":"Regreso a la Edad de Piedra","fr":"Back to the Stone Age","nl":"Back to the Stone Age","en":"Back to the Stone Age","de":"Zurück in die Steinzeit","it":"Back to the Stone Age"},"author":{"id":"obr:author:edgar-rice-burroughs","name":"Edgar Rice Burroughs","api":"https://openbookrank.com/api/v1/authors/edgar-rice-burroughs.json"},"year":1937,"pages":226,"originalLanguage":"en","identifiers":{"wikidata":"Q3632643","openLibrary":"OL1417913W","isbn13":null,"isbns":[],"isbnByLanguage":{},"googleBooks":null,"hardcover":"back-to-the-stone-age","amazon":null},"score":{"value":null,"scale":10,"ratings":1,"confidence":null,"rawAverage":null,"method":"bayesian-weighted-average","priorWeight":147,"minRatings":50,"methodology":"https://openbookrank.com/en/methodology"},"sources":[],"ranks":[],"popularity":{"ratingsPercentile":36,"wikipediaPageviews":3650,"editions":99},"series":{"id":"obr:series:pellucidar","slug":"pellucidar","title":"Pellucidar","position":null,"volumes":8,"api":"https://openbookrank.com/api/v1/series/pellucidar.json"},"awards":[],"adaptations":[],"similar":[],"citation":"BookRank (openbookrank.com) lists \"Back to the Stone Age\" by Edgar Rice Burroughs but does not score it: it has fewer than 50 reader ratings (snapshot 2026-10-28).","snapshot":"2026-10-28","license":"CC-BY-4.0"}