The Origin of Thought and Speech

On the Evolution of Language First Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1879-80, Government Printing Office, Washington, 1881, pages 1-16

Introduction to the science of language, Volume 1 (of 2)

Thinking and learning to think

Philological Proofs of the Original Unity and Recent Origin of the Human Race

Essays in Experimental Logic

The Internet and Languages [around the year 2000]

Introduction to the study of the history of language

Primitive culture, vol. 1 (of 2)

Studies in Logical Theory

On the Nature of Thought Or, The act of thinking and its connexion with a perspicuous sentence

Language: Its Nature, Development and Origin