Jonathan, the book goes for (without the dust jacket) anywhere from $600 to $1500 in the last couple of years. If (and that's a BIG if) a dust jacket is found it can double the price of the book. If there is a legit GT signature in the book, my guess would be the book would go for anywhere from $4000-$6000 (without dust jacket), depending on condition, from what I've seen in the past couple of years. I recently saw a first edition copy of Thomas book on Game Fish signed by him sell for $150, but obviously that book is not in as high demand than his book on architecture. The place Bill is referring to at Pebble is an excellent source for valuing something. There is a gentleman Ed knows as well who lives in Pacific Grove who has one of the best golf literature collections in the world, from what Ed has told me. He can give you an idea as well. As a side note, the Sleeping Bear reprint's go for several hundred dollars, while the USGA Collection reissue can be had for around $100. Hope this helps.