The webinar provided an overview of the Guide to Reference and how it can be used for reference, collection development, and teaching. It introduced the editors of the mathematics section, John Meier and Annie Zeidman-Karpinski, who discussed how they work as a team to select entries and described challenges such as working with interdisciplinary topics. The webinar demonstrated features of the Guide and encouraged librarians to get involved by contributing notes, becoming editors, or subscribing their libraries.