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= Filcheva, Ekaterina Georgieva
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**1 1**
Title	Author(s)	ISBN	Year
19th International Conference of Humic Substances and their Contribution to the Climate Change Mitigation, 16-21 September 2018, Albena Resort, Bulgaria [книга]	Filcheva, Ekaterina Georgieva (редактор, и др.)	978-619-90189-3-4	2018