The intent of this cataloging backlog project was to determine if there were specific categories of materials for which Library of Congress cataloging co y would be found within a limited period of time, and alternative, if there were identifiable categories of materials which should receive immediate local cataloging attention. A year's backlog at the University of Wyoming Library was sampled to learn some of the specific characteristics of these uncataloged materials. Among the characteristics included were the material's Library of Congress cataloging priority, subject areas, purchase plan, and type of cataloging copy available on OCLC. In addition to giving information about materials acquired but unavailable for use in a specific collection, this study provides a model for other backlog studies