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  1. 1
    by Johnson, R. W. M.
    Published 1970
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    An economic analysis of soil conservation and land retirement on South Island high country /
  2. 2
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    Effects of irrigation and nitrogen addition on the components of net ecosystem carbon balance in New Zealand grazed grasslands : thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Ecology at the University of Canterbury /

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