Which of the following is primarily focused on bibliographic information related to serials?

The EBSCO Serials Directory serves as a specialized resource that provides comprehensive bibliographic information on serial publications. This includes details about various types of serials such as journals, magazines, and periodicals. It allows users to search for and locate information about specific serials, including their titles, publication frequency, and availability, making it an essential tool for anyone needing in-depth bibliographic data on serial literature.

In comparison, the other options focus on different aspects of publishing and bibliographic information. The American Book Publishing Record primarily catalogs books rather than serials, making it less relevant to this inquiry. The Education Index is more focused on indexing articles and other educational resources, not exclusively on serials. Children's Books in Print specifically targets books aimed at children, which again does not encompass the broader range of serials. Thus, the EBSCO Serials Directory stands out as the clear choice for those seeking bibliographic information specifically related to serial publications.