Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Listov, A. A. 1971. O grozdevidnom plodonoshenii sosny v podzone severnoi taigi [Clustered coning in Scots pine in the northern taiga subzone] . Izvestiia Vysshikh uchebnykh Zavedenii, Lesnoe Zhurnal 14:129-130.
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