Dellow, G. D., Read, S. A. L., Begg, J. G., Van Dissen, R. J., & Perrin, N. D. (1992). Distribution of geological materials in Lower Hutt and Porirua, New Zealand. Bulletin of the New Zealand Society for Earthquake Engineering, 25(4), 332-344. https://doi.org/10.5459/bnzsee.25.4.332-344