1. Geophysics Division report 131;Broadbent M.,1978
2. _____. 1987a. “Resistivity measurements near Bob Ward's springs, North Christchurch: 1985”. Christchurch: Ministry of Works and Development Water and Soil Division. Unpublished report WS 1258
3. _____. 1987b. “Groundwater problems and resistivity surveying”. Christchurch: Ministry of Works and Development Water and Soil Division. Unpublished report WS 1230