What a perfect subject for my blog post. In the last blog post itself I talked about how difficult it might be to get cover images and just saw this really nice site where you can browse through thousands of cover images.
Book Cover Archive
Worth checking out! Would they agree to share the cover image?
E-books never were part of the main stream reading till big players like Amazon and Barns n Noble decided to jump in this market (2008-2009).
Earlier attempts at E-books were generally for very specific use by a small group of people. (Ex: Technical documents etc.)
You can read more about the history and evolution of e-books @ ebookweek site
what does wikipedia have to say about it:
An e-book (short for electronic book, also written eBook or ebook), also known as a digital book, is an e-text that forms the digital media equivalent of a conventional printed book, sometimes restricted with a digital rights management system. An E-book, as defined by the Oxford Dictionary of English, is “an electronic version of a printed book which can be read on a personal computer or hand-held device designed specifically for this purpose” E-books are usually read on dedicated hardware devices known as e-Readers or e-book devices. Some personal computers and cell phones can also be used, especially to read documents in pdf format.