It is not generally recognized, but Washington, D.C., is home to the largest body of accessible research materials in the world, larger even than the vast body of materials at the Family History Library in Salt Lake City. The aim of this book is to identify those resources in the Washington, D.C. area that will aid family historians in tracing their ancestors (the National Archives, Library of Congress, the DAR Library, the National Genealogical Society, and many more).