Who needs archives when you have the internet?
Auckland Art Gallery has digitised its exhibition catalogues from 1954 to 1969. This includes the 1963 McCahon / Woollaston retrospective, and the Contemporary New Zealand Painting series. The catalogues are available in PDF format
The AAG has also digitised the Auckland Art Gallery Quarterly from 1956-19789. The Quarterlies are available as PDFs, with HTML versions available for issues up to no. 25. You can search by issue, or by using the index of artists.
Christchurch City Libraries, along with the Christchurch Art Gallery, have digitised a number of Cantabrian resources, including The Group catalogues from 1927-1977. The Robert McDougall Art Gallery : a profile of the Art Gallery of the City of Christchurch, 1932-1982 is also available as a PDF from the CCL site.
An added bonus, Una Platt's Nineteenth century New Zealand artists : a guide & handbook is available as a PDF on the CCL site. The book is also available as HTML and as Microsoft Reader e-book on the New Zealand Electronic Text Centre site.
On the Christchurch Art Gallery site you can also access the Robert McDougall Art Gallery Survey publication, from 1971-1978, and the Bulletin, from 1979 to the present. All PDFs.
And finally, the National Library has digitised Te Ao Hou / The New World, a bilingual magazine published by the Māori Affairs Department from 1952-1956.
Happy online researching!