4 public-domain matches

Artificial Languages

Cover of Volapük in the schools

Volapük in the schools

H. C. Creed

Cover of Ido

Ido

Max Talmey

Cover of Delphos

Delphos

E. Sylvia Pankhurst, E. Sylvia Pankhurst

Cover of A universal language, formed on philosophical and analogical principles

A universal language, formed on philosophical and analogical principles

James Ruggles