Field assessment reveals the efficacy of the stocked-quadrat method for sampling douglas fir stands, indicating its suitability for varied ages.
Experiences of the Forest Survey in the Douglas fir region have proven that the four-mil-acre unit, 13.2-foot square, is a satisfactory size for the application of the stocked-quadrat method of sampling reproduction in Douglas fir stands of from 5 to 25 years of age.
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R. W. Cowlin (1932) studied this question.
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