You're right there are few good books on the subject. 16% solution is one of the best. Tax Sales are the most hazardous way to buy real estate and the rules vary tremendously from state to state and sometimes even county to county.
I was just at a real estate conference, and somebody there said that he had never heard of any tax sale anywhere, where all liens were NOT wiped out by the sale.
I said, "Obviously you've never heard of Pennsylvania!"