an Entity references as follows:
The Barbarastollen underground archive is an underground archive intended to preserve Germany’s cultural heritage from man-made or natural disaster. The Barbarastollen is located in a disused mine near Freiburg im Breisgau, Baden-Württemberg, Germany. It holds microfilms with about 1.12 billion images from German archives and museums. Among the documents stored here in microfilm facsimile are: