H. N. Coryell, Charles Hurst Sample, Pennsylvanian Ostracoda. A Study of the Ostracoda Fauna of the East Mountain Shale, Mineral Wells Formation, Mineral Wells, Texas, The American Midland Naturalist, Vol. 13, No. 5 (Sep., 1932), pp. 245-281
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Coryell et al. (1932) studied this question.
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