The keepers of a Nazi archive have delivered copies of Gestapo papers and concentration camp records to museums in Washington and Jerusalem, providing Holocaust survivors a paper trail of their own persecution. Six computer hard drives bearing electronic images of 20 million pages arrived late Monday at the US Holocaust Memorial Museum in Washington and to the Yad Vashem Martyrs' and Heroes' Remembrance Authority in Jerusalem. Last week, the director of the International Tracing Service, custodian of the unique collection that has been locked away for a half century in Germany released the files for transfer to the two museums. But it will be months before the archive can be used by survivors or victims' relatives to search family histories. Even after it opens to the public, navigating the vast files for specific names will be nearly impossible without a trained guide.