"This book is on my all-time top 10 list. While it is well worth the price, it is also available in its entirety online, at www.johntaylorgatto.com for free. I read it there first, and then purchased it to read again, annotate, and loan to friends. Gatto's books are all excellent, but this one is his opus.
I also highly recommend Education: Free and Compulsory by Murray Rothbard. This is also available online, free, at www.mises.org.
It was written decades ago, in the 60's I believe, and is amazing in its support of homeschooling, an option essentially unknown at that time. It is much shorter, at about 150 pages, than Underground History and so makes a good starting point.
Mises is a generally excellent source for all manner of libertarian writings. They operate an online bookstore, but every item they control the copyright to is also available free online.
As a result of these books (and many others also), we have liberated 3 of our children from the tyranny, thought control, and general low standards of our local magnet school