No restrictions on the content.
However, some records are protected under section 49(1)(a) of the Public Records Act 2005:
1) R12726447 - Access to this record is restricted because it is on display at Archives New Zealand. It can be viewed during normal opening hours unless otherwise notified. Alternatively, a copy (Micro-R3853) is available for viewing.
2) Some of records are restricted for preservation reasons. Where a copy or a duplicate exist this can be used as a viewing copy.
3) Photographs require that gloves are worn when viewing.
Access Services, Archives New Zealand, PO Box 12 050, Wellington, New Zealand
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Once you have been granted access, bring the original letter with you when you place your order for the records.