These have been around for a few months now, but I've only now noticed them and wanted to share. I've been using the Boundless website since launch and think the material is pretty good (although it's now paid

).
So anyway, I recently stumbled upon these books in the Kindle Store from a newsletter, they're all free and are pages straight from their website in a nicer eBook format.
There's key points at the beginning, figures/pictures, and it's just overall very well done as far as eBooks go.
Here's a link to their titles in the Kindle Store and a list of the topics they cover:
http://www.amazon.com/s/ref=ntt_athr...=relevancerank
- Accounting
- Algebra
- Anatomy & Physiology
- Art History, Volume I: Prehistoric-1400
- Art History, Volume II: 1400-Present
- U.S. History, Volume I: Pre-1492-1865
- U.S. History, Volume II: 1865-Present
- Business
- Calculus
- Chemistry
- Communications
- Finance
- Human Physiology
- Management
- Marketing
- Microbiology
- Physics
- Political Science
- Sociology
- Statistics
- Writing