Detail
Type Zk. - Schönberg is a Zinken (Outlying Farm).
A Freiburg - The Amtsbezirk for Schönberg is Freiburg. The Amtsbezirk is the District Office.
See Au 3) im Breisgau - A See notation means the entry is dependent on another entry. In this case, Schönberg is dependent on Au 3) im Breisgau, which should be consulted for additional information.