Prospector is 20 years old this month, August 2019. Originally developed as a regional union catalog for many of the major academic and public libraries in Colorado and Wyoming, today Prospector includes over 50 public and academic libraries and is the premier resource for sharing materials between libraries. Over the last decade Prospector has increased substantially. Close to half a million items are lent through Prospector on an annual basis and the catalog is home to over 30 million items including books, CDs, audio and electronic books and more.