Berry, W. B. N., 1960, Graptolite faunas of the Marathon region, west Texas, Publication 6005 of University of Texas Bureau of Economic Geology: Austin, Texas, 179 p.

Bulman, O. M. B., 1970, Graptolithina, 2nd. ed., p. V1-V163, in Teichert, C., ed., Treatise on Invertebrate Paleontology [2nd ed.]: p. V1-V163.

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