The Yale Divinity Library is one of the most important theological libraries in the world. It is responsible for building Yale's research collections in most areas related to the study of Christianity. The Day Missions Collection is the strongest collection of its kind, anywhere in the world. In addition the Divinity Library has particular strength in Biblical studies, Christian theology (both historical and constructive), and the history of Christianity. The Divinity Library collections now total more than 550,000 volumes of monographs, serials, and pamphlets; more than 270,000 pieces of microforms; nearly 5,000 linear feet of manuscript and archival materials. In addition, the Divinity Library has significant electronic collections, and growing collections of other non-print resources.