Detail
Type Hrgr. - Harenburg is a Häusergruppe (Group of Houses).
Kr Schleswig - The Kreis for Harenburg is Schleswig. A Kreis is a government district (similar to a U.S. county).
See Treia Schleswig - A See notation means the entry is dependent on another entry. In this case, Harenburg is dependent on Treia Schleswig, which should be consulted for additional information.