Detail
Type Zk. - Selzen is a Zinken (Outlying Farm).
A Freiburg - The Amtsbezirk for Selzen is Freiburg. The Amtsbezirk is the District Office.
See Horben 1) - A See notation means the entry is dependent on another entry. In this case, Selzen is dependent on Horben 1), which should be consulted for additional information.