OneClickdigital and eBooks
OneClickdigital offers a very small collection of ebooks, mostly public domain titles, in the ePUB format.
Please note: the OneClickdigital app that is used for listening to audiobooks on your device currently cannot be used to read OneClickdigital ebooks. The ebooks can be read on your computer using Adobe Digital Editions. To read them on a mobile device, it's necessary to download and install a separate OneClickdigital eReader app on your device to use it for reading ebooks from OneClickdigital.
This one OneClickdigital page, under the heading "eBook" links to the OneClickdigital reader in the app store for your device.