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calibre for Android
calibre - Download calibre
Calibre - MobileRead Forums
How to Get Calibre for Android (with Pictures) - wikiHow
calibre - E-book management
Calibre for Android Guide: How to Sync, Download and Read eBooks - Epubor
Calibre (software) - Wikipedia
Calibre Companion - Apps on Google Play
Calibre Mobile on the App Store
The calibre Content server — calibre 7.18.0 documentation