THE THECAL FORM OF SOME SLENDER LLANDOVERY MONOGRAPTUS.RICKARDS RB; RUSHTON AWA.1968; GEOL. MAG.; GBR; 1968(7), VOL. 105, NUM. 0003, P. 264 A 267Miscellaneous

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AGE DES COUCHES C A PENTAMERUS OBLONGUS ET CARACTERISTIQUE DE LA TRANSGRESSION DU LLANDOVERY SUPERIEUR EN EUROPE SEPTENTRIONALENESTOR KH.1972; IZVEST. AKAD. NAUK ESTON. S.S.R., KHIM. GEOL.; S.S.S.R. ; 1972, VOL. 21, NUM. 0004, P. 344 A 350Serial Issue

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