Navajo language
The men continued their work of analysis and documentation of Navajo; in 1980, 1987 they published "The Navajo Language: A Grammar and Colloquial Dictionary," representing "a huge increase in descriptive coverage" of the language. The 1987 edition included new appendices and grammar sections. It established itself as the major reference grammar of the Navajo language. Young, Morgan and Sally Midgette also produced the "Analytical Lexicon of Navajo" (1992), which re-organizes the lexicon by root, one of the principle elements in verbs and nouns of Athabaskan languages.