For my money it is "The Complete Guide to ECGs: A Comprehensive Study Guide to Improve ECG Interpretation Skills" by O'Keefe, Hammill, Freed, and Pogwizd. Available from
www.physicianspress.com. This is a GREAT learning tool that cardiology fellows use to study. The first part of the book is text, the second half case based with Q&A. It is awesome!
- H