How does one go about getting the Study Guide which goes with Harrison's Principles..

of Internal Medicine? When I was younger my uncle used to buy them for me every couple of years along with the main text (he was a GP). However, he has passed away, and the last one that I have goes with the 14th, not the 15th edition. I have tried Borders, and the local medical school book store, but they don't have a clue. The 14th edition study guide was by Richard M. Stone and was published by Bayer.