The US Department of the Interior Library promotes the mission of the Department by providing a full range of professional reference and research services, available to Interior employees in both the Washington, DC, area and nationwide. The Library's collections include documents produced by or for the Department, as well as a broad range of related books, journals, and other resources that support the Department's efforts to protect and provide access to the Nation's natural and cultural heritage and to honor its trust responsibilities to tribes. With nearly a million volumes in its collections, the Library serves an important role as the Departmental Library of Record for this cabinet-level agency, which spans the length of American history. The Library dates back to 1869. With greatly expanded scope and services, the Library promotes the mission of the Department by providing a full range of professional reference and research services by combining the timeless qualities of a traditional library with modern public access workstations and a powerful online catalog.