There are about 175,000 Navajo speakers and many of the 300,000 Navajo speak at least some of the language. No other of the 48 languages in the Na Dene family has as many speakers, so it IS the major language. The next biggest is 20,000 Western Apache. read more
One major university that teaches classes in the Navajo language is Arizona State University. In 1992, Young and Morgan published another major work on Navajo: Analytical Lexicon of Navajo, with the assistance of Sally Midgette (Navajo). read more