It has been almost 15 years since Chase published this book. Over this time it has become an ideological tract for those who dislike the Park Service. In order to understand this line of argumentation, all serious students of public land politics should read Chase.
Some of his criticisms are valid, but for those seeking a broader and more objective perspective on Yellowstone, more reading needs to be done.
One book that is particularly good, and which comments on the limited number of historical sources Chase used before concluding that early Yellowstone had few large animals, is Paul Schullery's "Searching for Yellowstone." Houghton-Mifflin. 1997.
Here is a footnote written to my review above (Sept. 2003). Almost all the deleterious effects of excessive and unamanged elk in Yellowstone which Chase describes have been eliminated by the reintroduction of the wolf. The size of the elk herds have declined somewhat, but of equal or greater importance, willows and aspen are showing rapid growth rather than decline for the first time in many years.
The wolves keep the elk moving and out of the dangerous zones (for elk) along the creeks where the willows grow. So the vegetation florishes.