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3. BASPT (Board for Agriculture and State Property in Turkestan) 1915 Zhurnal Vtorogo Soveshshaniya po ustroystvu Bazar-Kurganskoy lesnoy dachi, Bazar-Kurganskago Lesnichestva, Ferganskoj oblasti
4. Vegetation history of the walnut forests in Kyrgyzstan (Central Asia): natural or anthropogenic origin?;Beer;Quaternary Science Review,2008