You can get a free book on coin grading called How to Grade U.S. Coins by James L. Halperin.
You have to complete a short survey and you can either receive the book or the latest Heritage auction catalog. The offer is only for new registrants to the HA.com Web site.
Or you can call Heritage at 866-835-3243 and mention reference code #OTH16296.
Tip: Marc Ullman