Detail
Type Forsth. - Altenburg is a Försthaus (Forester's house).
Kr Gelnhausen - The Kreis for Altenburg is Gelnhausen. A Kreis is a government district (similar to a U.S. county).
See Kassel - A See notation means the entry is dependent on another entry. In this case, Altenburg is dependent on Kassel, which should be consulted for additional information.