The document attached to this article outlines the "Principles of Cooperation" for the SEO Consortium, detailing guidelines for member libraries on various operational aspects. It covers policies for library cards, user records, sharing and borrowing circulating resources, handling lost or damaged materials, and delivery protocols. Additionally, it addresses loan periods, cataloging standards, procedures for new material formats, and specific rules for display materials. These principles aim to facilitate efficient and consistent resource sharing and library services among SEO member institutions.