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| Spec | Library of Congress | Project Gutenberg | Libby |
|---|---|---|---|
| Category | Education & Learning | Education & Learning | Education & Learning |
| Pricing | Free | Free | Free with a library card |
| Rating | 4.7 (310,000) | 4.7 (12,800) | 4.8 (890,000) |
| Community | 90/100 | 93/100 | 94/100 |
| Tier | featured | featured | featured |
| Best for | library, archives, exhibitions, public-domain | ebooks, public-domain, books, library | library, ebooks, audiobooks, overdrive |
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