Linguistics

The Philosophic Grammar of American Languages, as Set Forth by Wilhelm von Humboldt

A Cursory History of Swearing

A Philosophicall Essay for the Reunion of the Languages

The American Language

The Public School Word-book

The Sounds of Spoken English

A Dictionary of the First or Oldest Words in the English Language

How to Date Korean Men

Similarities between Parthian and Zaza (Dimly)

A Gothic Grammar, with selections for reading and a glossary

Anglo-Saxon Grammar and Exercise Book with Inflections, Syntax, Selections for Reading, and Glossary

Vocabulum; or The Rogue's Lexicon

The Dialect of the West of England; Particularly Somersetshire

Rhetoric

The International Auxiliary Language Esperanto: Grammar & Commentary

Forallx – An Introduction to Formal Logic

Geographical etymology: a dictionary of place-names giving their derivations

Anglo-Saxon Primer, With Grammar, Notes, and Glossary

Romano Lavo-Lil: Word Book of the Romany; Or, English Gypsy Language

Language: An Introduction to the Study of Speech