This book is not terribly easy to use. But that's because Navajo is not terribly easy to speak -- or (looking at it the other way) to analyze. So I caution readers that they should spend some time learning the organization of the lexicon before they expect to be able to use it fluently. However, this book is /the/ must-own book for anyone who studies Navajo language or culture. Its thoroughness (somewhere over twenty-five thousand entries, I think) is astounding.