The District Keys have been produced as a finding aid to be used in conjunction with the Indexes to New Zealand Birth and Death Registrations, available on microfiche.
These booklets have now been scanned and are available free to NZSG Members on the NZSG website.
They are for the earlier books up to 1955.
The later volumes will follow if the demand is there for this service.
As well as scans of each page there are some excellent directions as to how to use this resource.