Two excellent articles by Brian Hayes;

Roading Law Applicable to Unformed Roads

Elements of the Law on Movable Water Boundaries

Archival material relating to PANZ from http://www.recreationaccess.org.nz/files/site_mapb.html

Foot-tracks in New Zealand: Origins, Access Issues and Recent Developments

An ebook by Pete McDonald published in July 2011

Reference to PANZ from page 200