Book excerpt: The 41st edition of this established reference work offers a wealth of information on the worldwide publishing landscape. It includes more than 1,100,000 publishers' ISBN prefixes from 221 countries and territories. The Geographical Section (volumes 1-5) provides the names of more than 1,000,000 active publishing houses, arranged alphabetically by country, and within country by name. Entries contain the full address including email and URL particulars as well as ISBN prefixes. Publishers can be identified via their ISBN prefixes through the Numerical ISBN Section (volumes 6-7). The eBookPLUS format comprises the content and search criteria of the printed edition and its indices, facilitating complex searches.