I analyzed circulation of print books at Seton Hall University Libraries using the WorldCat Analysis tool and Voyager data. Only 21.5% of our collection circulated between 2005 and 2009, but circulation varied by subject area. Circulation was higher for subjects with more current collections. Over one-third of recent science books circulated, while older science books had low circulation. Print book circulation declined by 23% between 2005 and 2009. Results of this study informed collection development and prompted a comprehensive weeding project, participation in an international scholarly reading study, and an e-book, patron-driven acquisition program.