Simple Tax Lien Investing.
This book is available for download with iBooks on your Mac or iOS device, and with iTunes on your computer. Books can be read with iBooks on your Mac or iOS device.
This book is a good resource on the mechanics of tax liens/tax deeds, how they are auctioned off, and strategies for investing through liens/deeds. Descriptions on how to successfully bid on lien/deed auctions and how to calculate rates of return.