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