Probably the best available resource once you get away from this forum.
Incomplete, especially as to axes.
Only one picture of each knife - blurry B&W.
"New edition" is same old edition.
Missing critical measurements..
"Prices" extremely imaginative.
Like 500 Scout Knives, primarily a pre-Internet product.
If you locate an item or information that is not in the book, the author has no interest in hearing from you.
I will add that like all "price guides" for knives, the prices shown are outdated almost before publication if they were ever even accurate at all. If so, depending on the author's depth of research and access to actual market data, they were accurate only during the period of time the survey was being conducted. The collector knife market is very fluid with demand for particular items being very fickle. Interests and demand for particular items ebbs and flows constantly. Imagine for a moment that a period of time elapses during which interest in a unavailable knife increases. Five collectors are looking for one high and low. Some are willing to pay whatever it costs to add one to their collection. Another collector/accumulator/dealer sees this and decided to take profit from the half dozen he is holding, perhaps purchased years before at MSRP or even a fraction thereof. The first pieces sell for handsome sums because of competition. As demand becomes satisfied competition decreased and subsequent sales net less to the point that the last piece sells below cost if at all. Meanwhile others see the initial high price and decide to take profits as well, flooding an already limited market with more available examples. Prices drop. So value is relative only to what a knife sells for in a particular instance, the transaction between a particular buyer and a particular seller at a particular place (market venue) and time.
At best, these "price guides" are identification guides and represent the author's best knowledge at the time of publication. Which is almost always constantly revised as new knowledge comes to light over time.