13 public-domain matches
Language Universals
Universals Of Language Second Edition Editor Joseph H Greenberg Linguistics Cambridge 1966 The MIT Press

R.U.R. and The insect play

Grammatical institute of the English language. Part 1

A dictionary of the English language

Language

Handbook of American Indian languages
Esperanto (The Universal Language)
Esperanto (The Universal Language)
R. U. R. (Rossum's Universal Robots)