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