The show covered cultural links with Italy and northern Europe, social history, and patronage.At the Hermitage, Hidden Treasures Revealed showed 74 works, including ones by Picasso and Edgar Degas, that had been removed from Germany at the end of World War II and since hidden in the museum. (See Sidebar.)Sandra MillikinPHOTOGRAPHYThe purchase in 1995 of the huge Bettmann Archive by software bill