FREE E-books.
You do NOT need to provide any personal data to download these eBooks.
When you click through to the pages for downloading you will find different file options for download. Pick the one that fits your device. Note: one option offered on the pages is to download them through Apple’s iBook store, but you can bypass that option and download the raw file, too. Just have a look around on the download pages to find the option that suits you best.