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Excerpt from Forest Worker, Vol. 5: January, 1929
Small holes in the canopy represent 10 per cent of the total area of the average second-growth Douglas fir forest according to the estimate of Mr. Meyer, who found that the most important cause of these holes is the presence of gullies, creeks, and small patches of hardwoods. Fire, he found, although it had gone through half the areas studied and had undoubtedly been a factor in thinning the stands when they were young, was not prominent as a cause of small holes in the canopy of forests of pole size and larger.
A digest of the principal yield tables for second growth Douglas fir was published in the West 'coast Lumberman of May 1, 1928.
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