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Evanoff, E. & Roth, B. (1992). The fossil land snail Helix leidyi Hall and Meek, 1855, a member of a new genus of Humboldtianidae (Gastropoda: Pulmonata). The Veliger. 35(2): 122-132.
Evanoff, E. & Roth, B. (1992). The fossil land snail Helix leidyi Hall and Meek, 1855, a member of a new genus of Humboldtianidae (Gastropoda: Pulmonata). The Veliger. 35(2): 122-132.
