Roth, B.; Miller, W. B. (1993). Polygyrid land snails, Vespericola (Gastropoda: Pulmonata), 1. Species and populations formerly referred to Vespericola columbianus (Lea) in California. The Veliger. 36(2): 134-144.
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Roth, B.; Miller, W. B.
1993
Polygyrid land snails, Vespericola (Gastropoda: Pulmonata), 1. Species and populations formerly referred to Vespericola columbianus (Lea) in California.