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4. W. B. Critchfield and E. L. Little, Geographic Distribution of the Pinus of theWorld (US Dept. Agricult., Washington, 1966).
5. V. I. Baranov and M. N. Smirnov, Fir Taiga in Altai Piedmont:, Transactions of Perm Biol. Nauch. Issled. Inst. (Perm, 1931), Issue 4 [in Russian].