The International Auxiliary Language Esperanto: Grammar & Commentary

A Complete Grammar of Esperanto

Ivy Kellerman Reed

International Language, Past, Present & Future With Specimens of Esperanto and Grammar

Walter John Clark

English-Esperanto Dictionary

O'Connor, J. C. (John Charles); Hayes, C. F.

Ifigenio en Taŭrido

Johann Wolfgang von Goethe

Het Esperanto in Twintig Lessen

A. Blok

The Esperanto Teacher: A Simple Course for Non-Grammarians

Helen Fryer