VATICAN CITY (CNS) -- To mark the 150th anniversary of Mary's appearance to St. Bernadette Soubirous near Lourdes, France, Pope Benedict XVI authorized a special indulgence to encourage renewed holiness.Catholics can receive a plenary indulgence for taking part in any public or private devotion to Our Lady of Lourdes, said U.S. Cardinal J. Francis Stafford, head of the Apostolic Penitentiary, a Vatican court dealing with indulgences and matters of conscience.