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  1. 1
    by Firth, J. (John), 1946-
    Published 1984
    “...Forest Research Institute, New Zealand Forest Service,...”
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    The use of aerial photographs to estimate the stocking and basal area of P. radiata thinned to final stocking /
  2. 2
    by Firth, J. (John), 1946-
    Published 1985
    “...Forest Research Institute, New Zealand Forest Service,...”
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    A preliminary study of techniques for estimating harvesting-related soil disturbances from aerial photographs /

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