The landmark 518-page publication by Beu & Maxwell (1990, NZGS Paleontological Bulletin 58) is long out of print. It has been scanned to produce this PDF version. N.B. download is large, 84 Mb. Download here.
The PDF file is also available on CDfrom GNS Publications, price NZ$40. Order form here.
Cenozoic Mollusca of New Zealand