The James O. Hall Research Center, a well-stocked research library, is available to those studying the Lincoln assassination. Included are microfilm holdings on the Lincoln Assassination Suspects file from the National Archives, Library of Congress materials, Provost Marshal's files, Old Capitol Prison records, and more. Also available are all major books on the subject, many of which are out-of-print, as well as extensive vertical file information. The research center is open by appointment by calling 301-868-6185.