Thomas Pynchon's Mason & Dixon (1997)
Note: Will appear in a collection of essays on Mason & Dixon entitled The Multiple Worlds of Pynchon's Mason & Dixon: Eighteenth-Century Contexts, Postmodern Observations (Elizabeth Jane Wall Hinds, editor; published by Camden House [Boydell & Brewer Inc.], in 2005.
The Encyclopedia Brittanica Online
White Clay Creek State Park Site
(Mason & Dixon were here...)