Dr. Joyce Harman
THIS IS OUT OF PRINT, BUT YOU CAN GET THE E-BOOK HERE:
You can find used and new copies on the web (Amazon, etc)
Dr. Harman's saddle fitting book is still available, now as an ebook! This book was 10 years in the making, and is the only and most complete book about saddles and horse's backs ever published. If you ride, your horse needs this book, and since most of them cannot read (there are a few I think can) you will need to buy it so you can check to be sure your horse is comfortable.