To discover zine titles collected in libraries, access WorldCat and use the Advanced Search to search "zines" and set up the drop-down menu to Genre/Form under Subject. See also ZineWiki, that lists zine titles, collections, distribution services, and more.
The Campus Underground: 1960s–1970s publications from college and university campuses and surrounding communities.
Artzines.info: Art zines, some in full-text, accompanied with artists/authors annotations and a separate section for bibliographies.
Independent Voices (1960s–1980s): Index to independent alternative press, covering feminists, dissident GIs, campus radicals, Native Americans, anti-war activists, Black Power advocates, Latinos, LGBTQIA.
Paskow Science Fiction Collection, Temple University Libraries: Includes the Enterprising Women Fan Fiction Collection (EWFFC), fanzines, underground, and circuit literature written, designed, produced and distributed by female fans of science fiction media teleplays, actors, and characters.
Prelinger Library: A zine collection of about 10,000 items, not fully processed. Prelinger Library is an independent research library in San Francisco.