Georgi Čatalov

Petroleum Consultant, Hebelstrasse 12, D-6909 Walldorf/Baden F. R. Germany
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Volume 22 6 December 1992

Geological lnstitute, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Rljksuniversiteit Utrecht, Laboraroritum voor Paleobotanie en Palynologie, Heidelberglaan 2, Utrecht 2506, Nederland

Volume 20 2 April 1990

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia

Volume 18 6 December 1988

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia

Volume 18 5 October 1988

Paul-Hindemilh-Ring 4 b, D-6054 Rodgau 1 (Jügesheim), F. R. Germany
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Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia

Volume 18 3 June 1988

Geological Institute, Bulgarian Academy of Sciences, 1113 Sofia

Volume 18 1 February 1988