This (Kindle Edition) is a very short compilation of twenty-two of Leonardo's works. While there is very little historical information added to these images (I was hoping for more and this lack of info is why I rated this work three stars
) it does appear to be honest and accurate.
The images are in full color (for pc and the appropriate Kindle devices)and beautifully displayed. This alone is worth the 99 cent price.
I hope the compiler Joel Lehman will add more historical info in the rest of his series.