The complete historic legislation for New Zealand, from 1841 to 1940, can be found at the Early New Zealand Statutes site. (Note: I’ve had trouble getting the index page to work on some computers / browsers; see the mirror at archive.org in case of difficulties.)

PDFs of some of New Zealand’s historic legislation, as enacted, can be found at NZLII. See also the official New Zealand Legislation site, and the lists of statutes on Wikipedia.

For information on the digitization program, see the NZ Parliamentary summary.