Librarian Kelly Smith at the U.C. San Diego has created a new LibGuide that she hopes will be of some use to other librarians and users. Called "Browse Federal Documents by Call Number", the guide’s primary purpose is to allow users to browse UCSD’s federal documents collection by call number. However, it goes beyond that by including call numbers that are not in UCSD's collection – essentially, it’s an historical list of SuDocs assigned to agencies over the years. There’s also a companion guide that sorts the agencies by name and leads users to the associated SuDocs number. If you find cataloging fascinating - and what librarian doesn't? - it's a great guide to finding SuDoc numbers but more importantly it's fun to browse alphabetically to see all the federal agencies that have put out documents over the years.