The book "English-Esperan Dictionary" is written by the duo of authors O'Connor, J. C. (John Charles) and Hayes, C. F. (Charles Frederick). This is an indispensable reference for those interested in learning Esperanto or needing to translate English terminology into this mysterious language. The collection contains a wide range of words and expressions that help in understanding and learning English through an original Esperanto approach. The English-Esperanto Dictionary is a necessary guide for translation between these two languages and contributes to the development of international language communication.