@prefix rdf: . @prefix prov: . = { rdf:type prov:Entity ; prov:value "LETTERS OF A NATION not only features letters by such American leaders as George Washington, Thomas Jefferson, Abraham Lincoln, Franklin D. Roosevelt, and Ronald Reagan, but messages from Cesar Chavez, Susan B. Anthony, Dr. Martin Luther King Jr., Dorothy Day, Phillis Wheatley, Frederick Douglass, Rabbi Stephen Wise, and many lesser known, though no less remarkable, Americans from all walks of lif" ; prov:wasQuotedFrom . prov:wasDerivedFrom . prov:wasDerivedFrom . prov:wasDerivedFrom . }