9 results Refine Results
  1. 1
    by Hughes, Helen R.
    Published 1976
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    Research into aquatic weeds in New Zealand waterways : a review /
  2. 2
    by Hughes, Helen R.
    Published 1993
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    New Zealand's clean green image : fact or fiction? /
  3. 3
    by Hughes, Helen R.
    Published 1974
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    Lake Ellesmere, Canterbury, New Zealand : a review of the lake and its catchment /
  4. 4
    Published 1991
    Other Authors “...Hughes, Helen R....”
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    Report on New Zealand environmental management, 1987-91.
  5. 5
    Published 1988
    Other Authors “...Hughes, Helen R....”
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    Importation of marron (Cherax tenuimanus) : investigation of the Ministry of Agriculture and Fisheries approval procedures.
  6. 6
    Published 1995
    Other Authors “...Hughes, Helen R....”
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    Timberlands West Coast Ltd draft beech management prescriptions : review panel report /
  7. 7
    Published 1991
    Other Authors “...Hughes, Helen R....”
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    The control of marine oil pollution in New Zealand : a review of the system /
  8. 8
    Published 1981
    Other Authors
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    The Effects of land use on water quality : a review /
  9. 9
    Published 1980
    Other Authors “...Hughes, Helen R....”
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    Aquatic weed control in Lake Wanaka : [report by the Lake Wanaka Working Party to the Officials Committee on Eutrophication] /

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