Detail
Type Ab. - Birkhof is a Abbau (Surface Mine).
Kr Rummelsburg - The Kreis for Birkhof is Rummelsburg. A Kreis is a government district (similar to a U.S. county).
See Falkenhagen - A See notation means the entry is dependent on another entry. In this case, Birkhof is dependent on Falkenhagen, which should be consulted for additional information.