The Tsolyáni Language, Volume One is a supplement that explores the basic points of the Tsolyáni language and presents discussion of how its pronunciation and grammar function, while Volume Two is a vocabulary of English to Tsolyaniwords.
Frederick Paul Kiesche III reviewed The Tsolyáni Language, Volumes I & II in Space Gamer No. 71. Kiesche commented that "These volumes are highly technical and not for casual reading. Given Professor Barker's linguistic background, they are technically correct. They are not meant for every gamer or referee, but if you want to add an exceptional amount of realism to a game of EPT/''S&G'', this will prove to be an invaluable guide."