Collections within collections
Zine-making is often more social in nature than the traditional book writing process. Zines can be collaborative projects with many contributors adding to the pages of a single issue, and it's not unusual for them to be part of an exchange where copies of a zine are sent out in return for others. Because of this many of the zines available at Ricker are listed as collections within the collection rather than as individual booklets, so be on the look-out for that!
Where else to look?
Besides Ricker Library, there are some other libraries at the University with substantial numbers of zines within their collections. This includes, but is not limited to:
RBML has a custom advanced search tool
The University Archives also has one. Generally, unless the materials are in Oak Street Library for off-site storage, they won't come up in a regular search through the main library catalog
What else to look out for?
Sometimes, what will come up in a search for zines are items that may not match what your definition of zines is, but may still be related and helpful to your questions anyways. These are some of the common overlapping terms and subjects:
[insert here variations on press, comic books, media, strips, etc]
The following databases are great places to search for journals, articles, essays, and reviews:
These are some specific examples of materials you can find through them: