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4. Allen, G. S. 1958. Factors affecting the viability and germination behavior of coniferous seed. Part II. Cone and seed maturity. P seudotsuga menziesii (Mirb.) Franco. Forestry Chronicle 34: 275–282.
5. Allen, G. S. 1960. Factors affecting the viability and germination behavior of coniferous seed. Part IV. Stratification period and