I read this book over winter while planning for summer rides here in Alaska. Honestly, I was somewhat...underwhelmed...by this book. First, the book is rather out of date. South-central Alaska (the area around Anchorage all the way north to Mt. McKinley) has grown up a lot since Dr. Frazier last visited. Second, Dr. Frazier's section on dealing with bears -- always a distinct possibility in Alaska, British Columbia and the Yukon Territories -- left much to be desired. In particular, I disagree with his assessment of the use of bear spray and firearms. If you don't, won't or can't carry either a very large caliber handgun or shotgun, then at the very least, carry bear spray in bear country! While most of the time, bears will leave you alone unless you provoke them, homo sapiens is *not* at the top of the foodchain in the 49th state. Third, I'm just not a big fan of Dr. Frazier's writing style. In my humble opinion, there are plenty of other adventure motorcycling writers whose work I'd much rather read -- notably Ted Simon, Gregg Heggstead and Chris Scott.
To sum up, if you are wanting to ride to Alaska, rather than this book, I'd recommend a general adventure touring book (for the motorcycle portion of the trip) and the most recent edition of the Alaska Milepost (for information on traveling in Alaska).