Two extremely valuable community created resources for 20th century science fiction fandom are Fancyclopedia 3 and Fanac. Both of these have extensive information about science fiction fanzines (creators/editors, numbers of issues, title changes, distribution dates, etc).

The Eaton Collection holds numerous fanzines. These are primarily in the Fanzine Collection (MS 342), the Terry Carr Collection (MS 359), and a handful of specific titles have been fully cataloged. All of these can be found in the UCR library catalog. There are also fanzines in the Poul and Karen Anderson papers (MS 040) and the Stu Shiffman papers (MS 404), which are noted in their respective finding aids.