A FIND OF GONIATITES IN THE LOWER KAZANIAN IN THE NORTHERN PART OF THE RUSSIAN PLATFORM.KULIKOV MV; PAVLOV AM; ROSTOVCEV VN et al.1973; DOKL. EARTH SCI. SECT.; USA; DU RUSSE: DOKL. AKAD. NAUK S.S.S.R., S.S.S.R. 1973; 211, NO 6, 1408-1411,1973, VOL. 211, P. 112 A 114Miscellaneous

STRATIGRAPHY OF THE LOWER PERMIAN SERIES IN THE NORTH OF THE RUSSIAN PLATFORM.KASHIK DS; ALEKSEEVA IA; NEL'ZINA RE et al.1969; DOKL. EARTH SCI. SECT.; USA; 1969(7), VOL. 187, P. 26 A 29Miscellaneous

SUR LA STRATIGRAPHIE DU PERMIEN INFERIEUR DU NORD DE LA PLATE-FORME RUSSE.KASHIK DS; ALEKSEEVA IA; NEL'ZINA RE et al.1969; DOKL. AKAD. NAUK S.S.S.R.; SUN; 1969(7), VOL. 187, NUM. 0002, P. 399 A 402Miscellaneous