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A method of phenological survey for use in forest insect studies. 1956. Morris, R.F.; Webb, F.E.; Bennett, C.W. Can. J. Zool. 34: 533-540.
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A method of phenological survey for use in forest insect studies. 1956. Morris, R.F.; Webb, F.E.; Bennett, C.W. Can. J. Zool. 34: 533-540.