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Pip, E. (1987). Morphological anomalies in the shell of natural populations of Helisoma trivolvis Say (Gastropoda: Planorbidae). The Nautilus. 101(3): 140-142, figs. 1-4.
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Pip, E.
1987
Morphological anomalies in the shell of natural populations of <i>Helisoma trivolvis</i> Say (Gastropoda: Planorbidae).
The Nautilus
101(3): 140-142, figs. 1-4
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