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