Just how exciting can a book about the Antiquities Act of 1906 be? Probably more so than you would think--certainly it was for me. It's not the history of an obscure, 100-year-old law; this is the story of fundamental questions of importance to all Americans. It is the story of visionaries trying to preserve a heritage that, even then, was vanishing. It is the story of bruising political battles that continue even to today. It is the story of how public archaeology came into being in the United States. Ultimately, it is the story of how we decided to treasure our nation's cultural--and natural--heritage.
Couple of good links in there, too, especially the one to NPS's Antiquities Act Cntennial page.