A historic archive of Freemasonry amassed by the Nazis in their wartime purge could still reveal secrets about the society, researchers say. From insight into women's Masonic lodges to the musical scores used in closed ceremonies, the trove - housed in an old university library in western Poland - has already shed light on a little known history. But more work remains to be done to fully examine all the 80,000 items that date from the 17th century to the pre-World War II period.