Cheney, inbreeding, and poverty

Slate has an article (inspired by Dick Cheney’s recent linking of West Virginia to inbreeding) on the origins of the myth that inbreeding is a common or even accepted practice in WV.
They quote a historian who researched the topic specifically:
“In 1980, anthropologist Robert Tincher published a study titled “Night Comes to the Chromosomes: Inbreeding and [...]