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Figure 3 Global Heat Flow Database
Figure 5b Grindley, G.W. (1965) The Geology: Structure and Exploitation of the Wairakei Geothermal Field, Taupo, New Zealand, The Institute of Geological and Nuclear Sciences Limited
Figure 7 Willes-Richards, J., et al. (1990) ; HDR Resource/Economics' in Baria, R. (ed.) Hot Dry Rock Geothermal Energy, Copyright CSM Associates Limited
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