Delcho Mollov

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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General Company for Hydraulic Studies, Horns, P. O. Box 752, Syria

Volume 20 1 February 1990

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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General Company for Hydraulic Studies, Homs, P. O. Box 752, Syria

Volume 19 5 October 1989

Geological Institute, Bulgarian Academy of Sciences, 1113, Sofia
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General Company for Hydraulic Swdies, Houts, P. 0. Box 752, Syria

Volume 19 3 June 1989