In this rewarding study, Melissa Adler shows how systems used to classify and catalogue information for libraries operate as mechanisms of control. In particular, she focuses on the ways sexual identities are constructed and disciplined through library practices. Using Eve Sedgwick's work as a paradigmatic test case, and the Library of Congress as a site, including its infamous Delta Collection, she produces a study that is as compelling as it is far-reaching in its implications. A must-read for present and future professionals, but also, a useful text for anyone concerned with official instruments for the production of knowledge.––-Johanna Drucker, Breslauer Professor, Information Studies, UCLA