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17th International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM 2017
- 1.. 17th International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM 2017. Sofia: STEF92 Technology, 2017. ISBN 978-619-7408-13-3. ISSN 1314-2704.
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