Esperanto : the student's complete text book : containing full grammar, exercises, conversations, commercial letters, and two vocabularies / edited by J. C. O'Connor and revised by Dr. Zamenhof. [Rev. ed.] (Kolekto esperanta)
Esperanto : the student's complete text book : containing full grammar, exercises, conversations, commercial letters, and two vocabularies / edited by J. C. O'Connor and revised by Dr. Zamenhof.