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| Spec | WorldCat | Open Library | Project Gutenberg |
|---|---|---|---|
| Category | Education & Learning | Education & Learning | Education & Learning |
| Pricing | Free to search | Free | Free |
| Rating | 4.6 (24,000) | 4.5 (8,600) | 4.7 (12,800) |
| Community | 91/100 | 88/100 | 93/100 |
| Tier | featured | verified | featured |
| Best for | libraries, catalog, books, isbn | books, library, borrow, catalog | ebooks, public-domain, books, library |
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