84(4):131-142.Tables I, II, Figs.123.Hubricht, Leslie.1958.Quickella vermeta and Sucdnea indiana.The Nautilus 72(2):60-61.1961.Eight New Species of Land Snails From the Southern United States.The Nautilus 75(l,2):26-32, 60-63, PI. 4, figs. 1, 2.
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Harald Alfred Rehder (1985) studied this question.
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