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Hydrogen sulfide (H2S) is highly toxic, and in geothermal regions there is always a risk of poisoning, especially if concentrations build up in confined spaces. In 1965 the Bay of Plenty telephone directory listed a number to call for Rotorua residents in case of suspected poisoning.
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Reference: Bay of Plenty telephone directory (1965), inside front cover
Permission of the Alexander Turnbull Library, National Library of New Zealand, Te Puna Mātauranga o Aotearoa, must be obtained before any re-use of this image.