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Time for a closer look at nitrates?
https://niwa.co.nz/publications/isu/instrument-systems-update-22-june-2018/time-for-a-closer-look-at-nitrates
Looking after water in our towns and cities
https://niwa.co.nz/freshwater-and-estuaries/freshwater-and-estuaries-update/freshwater-update-79-november-2018/looking-after-water-in-our-towns-and