13th SGEM GeoConference on Ecology, Economics, Education And Legislation
(2013). 13th SGEM GeoConference on Ecology, Economics, Education And Legislation. International Multidisciplinary Scientific GeoConference-SGEM, 2. SGEM: Sofia. ISBN 978-619-7105-05-6.
Deel van: International Multidisciplinary Scientific GeoConference-SGEM. SGEM: Sofia. ISSN 1314-2704, meer
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