iOS 13.1 and iPad 13.1 User Guides
Euan Williams iPad OS
iPad OS 13.1 Web
iPad OS 13.1 Books
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iOS
iOS 13.1 Web
iOS 13.1 Books
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It may be useful to download the Books versions to another device such as your Mac so they can be consulted without getting in the way of activity on your iPad or iPhone.
Note that the Books have to be downloaded separately, transfer by AirDrop doesn't work.