This e means that the book is also in a database.The next time you’re in the library, you might notice a blue E sticker on the spine of some of the reference books. This means that there is a digital version of the book inside one of the Gale databases to which we subscribe. If the E has a yellow dot in the upper left corner, the articles in the book can be found in the World History Resource Center. If the dot is orange, then the book can be browsed or searched in the Virtual Reference Library.