Hancox, G.T. 1978 Motu River power development M56 (Mangaotane) dam site: summary of the previous geological work and proposed programme of engineering geological investigations. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 309 10 p.
Abstract: The M56 dam site (formerly called the Mangaotane dam site) on the Motu River is described and previous geological work and the investigations carried out from 1958-64 are summarised. A programme of future engineering geological investigations at this site is proposed. (auth)