The University of Los Angeles has free over 1800 children's ebooks in English, which you can download or read online.
The collection contains classic books such as Cinderella and the Oz Wizard, as well as ebooks with poetry, education and fantasy. You can read them online or download them in a wide variety of styles, including EPUB, Kindle, PDF and more.
At by clicking here of UCLA (University of Los Angeles) you will find books by year versions from 1728 to 1999. The newer books are probably the minority. The oldest of them even contain illustrations on wood. The books we tried (from the earliest ones) had readable text in image format, although some were a bit dark.
Books can be sorted by title, publication date and author. Can you do search using themeda, year, collection or creator. The default view is thumbnails but you can also view them as a list.
Books are printable in PDF format, although the pages will vary in size. See the online library from here (UCLA collection of children's books)