From the introduction: "The purpose of this paper is to present some of the principal features of Mayan languages. It will also touch on genetic relationships among the major members of the Mayan language family, as well as sketch some inferences regarding past migrations and inter-group contacts.
"A study of this nature is necessarily limited; only a few aspects of the languages are handled, and then only in a broad way. Nevertheless, a reading of this introductory work should provides beginning point for further study, especially for the student who may be contemplating doing field work in a Mayan language."
Oltrogge, David F.
"A sketch of Mayan languages,"
Work Papers of the Summer Institute of Linguistics, University of North Dakota Session: Vol. 18, Article 17.
Available at: https://commons.und.edu/sil-work-papers/vol18/iss1/17