The term 'Either of Two Books of the Apocrypha' refers to two books of the Bible, Esdras and Nehemias. Esdras is a book of the Apocrypha, which is a collection of ancient Jewish religious texts that are not part of the Hebrew Bible. It is believed to have been written in the 4th century BC and is composed of two parts: Esdras I and Esdras II. The book is named after the prophet Ezra, who is said to have written it. It contains stories about the return of the Jews from exile in Babylon and the rebuilding of the Temple in Jerusalem.