A research file with a map that was released after reaching a 75-year confidentiality limit has caused a stir in the Netherlands over the past week. On Jan. 3, the Dutch National Archive made public an old map believed to mark a spot in the eastern part of the Netherlands where millions of dollars worth of treasure were hidden by German soldiers during World War II. The maximum period of 75 years, during which the file with the map could be held confidential, expired. The institute said the map was believed to reveal where Nazi soldiers hid four boxes of...