"We'd love to hear from people who may have stories, anecdotes, information, photos – anything that might help us fill in gaps in our knowledge," Bell added.
"We already have access to a lot of information held in public collections, like the Alexander Turnbull Library for example. It's the personal material that we're really interested in; the sort of stuff we can't find on Google.
"The other thing to add is that we don't need the originals. We can easily digitise materials and return photos and documents promptly. It's the information that we need, not the object itself."
New information would be added to Heritage New Zealand's existing knowledge base, informing the approach taken to conservation, and potentially broadening interpretation of the properties.
Anyone who would like to share their connections with historic places in Northland was encouraged to write them down and send them to Alex Bell, Te Waimate Mission, 344 Te Ahuahu Road, Waimate North 0472.