Sada, K. and Danner, W. R., (1973), Late Lower Carboniferous Eostaffella and Hexaphyllia from central Oregon, U.S.A. Trans. Proc. Palaeont. Soc. Japan, N. S., no. 91, pp. 151-160
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Sada, K.; Danner, W. R.
1973
Late Lower Carboniferous Eostaffella and Hexaphyllia from Central Oregon, U.S.A.