This is a bibliography of books published in English between 1914 and 1987, on the First World War. There are approximately 6800 entries, indexed by author or title, listed under 350 subject headings. The subject headings range, in alphabetical order, from addresses and speeches to Zimmerman. Each entry gives bibliographical details where possible, any changes in title between United Kingdom and United States of America editions and cross-references to other relevant subject headings. For quick reference there is an index of authors and an index of subject headings. While this bibliography aims to be a reference work for the scholar and researcher, it is also intended to be for more general use.