keyword: Science – 79 free books.
All these books are free to read: either they're distributed with a free license, or they're in the public domain.
These books are available in EPUB format - good for iBooks, Nook, Kobo.
These books do not seem to be included in the Directory of Open Access Books.
Kieran Gallagher and Lizhi Fan
Amy Brown and Greg Wilson
Aseem Sharma et al.