Murphy - Declarative Language Handboo - New paperback or softback - X555z

Universal Language: Telepathy (Paperback or Softback)

Major - Universal Language - New paperback or softback - X555z

Rowland - A Grammar of the Welsh Language - New paperback or softback - X555z

Fig - 30 Day Language Learning Challenge - New paperback or softback - X555z

Nussbaum - Cosmopolitas o patriotas - New paperback or softback - X555z

Kirchhoff - Volapuk on Universal Language - New paperback or softback - X555z

Horton - Written Telepathy - New paperback or softback - X555z