BERGSTRöM, S.M. - Middle and Upper Ordovician conodont and graptolite biostratigraphy of the Marathon, Texas graptolite zone reference standard.

1978. Palaeontology 21; pp. 723-758, 9 fig. 2 plts. with conodonts. Orig. extract, small libr. stamp on title page, very good.

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