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TRILOBITEN MIT "KULM-CHARAKTER" AUS DEM NAMUR B. = TRILOBITA A "CARACTERE CULM" DU NAMURIEN BGANDL J.1980; SENCKENB. LETHAEA; ISSN 0037-2110; DEU; DA. 1980; VOL. 60; NO 4-6; PP. 291-351; ABS. ENG/SPA; BIBL. 2 P.; 4 PLANCH. ; ILL./PL.Article