This book is over 30 years old, so some facts are, most likely, out of date.
That said, I actually did learn some interesting things from it. For being a picture book, it's packed full of information! It does not always specify what part of Alaska it is referring to, though.
One more note to add that it uses a term for the Inuit, Yup'ik, and Inupiaq peoples that is often considered to be a slur now. I still hear it used here in Alaska, even by some Indigenous people. But I've heard that in other places, it's considered offensive. So I'd suggest either not reading this to children or using it as an opportunity to talk to them about the ways we refer to people.