After more than 60 years, Nazi documents stored in a vast warehouse in Germany were unsealed Wednesday, opening a rich resource for Holocaust historians and for survivors to delve into their own tormented past. The archive's index refers to 17.5 million people in its 16 linear miles of files. The treasure of documents could open new avenues of study into the inner workings of Nazi persecution from the exploitation of slave labor to the conduct of medical experiments. The archive's managers planned a conference of scholars next year to map out its unexplored contents. The files entrusted to the International...