Big score tonight when I happened upon this:
Pupillid land snails of eastern North America
by Jeffrey C. Nekola and Brian F. Coles
It's basically an updated key to the the Pupillid (Pupilidae, Gastrocoptidae, Vertiginidae) Snails. That's about as hot as it gets. Relatively speaking.
This seems to be a busy team as they also wrote a few more papers available online:
A discovery of a new Vertiginidae snail in 2007- Vertigo malleata
A paper on acidic preferences of land snails
And one with Ulfar Bergthorsson on the Evolution of the Vertigo gouldi group using DNA testing