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Elemental composition of surface soils in Nature Park Shumen Plateau and Shumen City, Bulgaria

, K.; Karatoteva, D.; Venkova, R., Soil Contamination in Forest and Industrial Regions of Bulgaria, IntechOpen , 2016 . doi:10.5772/64716. [6.] Malinova, D., Investigation on Soil Polution of Different Landscapes on the Territory of Bulgarka Natural Park, Forest Science , 2010 , 2 :75-84. https://naukazagorata.files.wordpress.com/2013/02/article-2-2010-full-text-71.pdf [7.] Djingova, R.; Wagner, G.; Peshev, D., Heavy metal distribution in Bulgaria using Populus nigra ‘Italica’ as a biomonitor, Sci Total Environ , 1995 , 172 :151-158. doi:10

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