Free High School Science and Math Textbook Downloads

I just discovered free Amazon Kindle books which can be downloaded to a PC(and other devices) without having to purchase the Kindle. All that is required is a free Kindle PC reading application download.

CK-12 Chemistry
Ten others here.

These text books are originally from this site which offers free digital textbooks for K-12 for mathematics, science, technology, and engineering. You can download them from either Amazon or this site.

All Amazon Kindle freebies here.