Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Stefanov, D., and B. Saschev. 1949. Uber die Ursachen der Massenvertrocknung von Forstkulturen im "Park der Freiheit" in Sofia [In Bulgarian]. God. SSA "Georgi Dimitrov", Lesotechn. Fak., Bd. 2.
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