
Publication
ECOLOGICAL STATUS OF OLD OIL BOREHOLES IN CENTRAL NORTHERN BULGARIA
(STEF92 Technology, 2019-06-20, Sava Kolev)
Hydrogeology, Engineering Geology and Geotechnics2019
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(STEF92 Technology, 2019-06-20, Sava Kolev)

(STEF92 Technology, 2018-06-20, Sava Kolev)