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