This article focuses on nonfiction titles appropriate for mid-sized public libraries, with a special emphasis on bisexuality, transgender identities, race, disability, class, age, and other issues often marginalized in both mainstream and GLBT (gay, lesbian, bisexual, transgender) culture in America. Some colleagues, at San Francisco Public Library (SFPL) and elsewhere, have confidently assured me that no gay people use their library. Oh, really? This claim has also been reported by librarians around the country, as Ellen Greenblatt writes in "Barriers to GLBT Library Service in the Electronic Age" (Information for Social Change, No. 12, Winter 2001). GLBT users are often invisible. A patron may be exploring his/her own sexual identity, or a patron may be trying to understand better a friend or family member, researching for the debate team, or merely broadening his or her horizons.