Detail
Type Hrgr. - Unterburg is a Häusergruppe (Group of Houses).
A Donaueschingen - The Amtsbezirk for Unterburg is Donaueschingen. The Amtsbezirk is the District Office.
See Neuenburg 2) - A See notation means the entry is dependent on another entry. In this case, Unterburg is dependent on Neuenburg 2), which should be consulted for additional information.