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