First published in 1958, this is a simple and concise Navajo–English only dictionary. It has over 9000 entries and contains many useful every day expressions. It was originally intended for the native Navajo speaker to learn English and for non–Navajos who want to acquire some knowledge of the Navajo language.
A Good Reference for a Very Hard Language I studied Navajo for three semesters at University of Arizona back in 2010 to 2011. This is the hardest language I've ever studied in my lifetime. This book is a must have if you plan on doing any research on Navajo.