Labov, William; Ash, Sharon; Boberg, Charles (1997). "A National Map of the Regional Dialects of American English" and "Map 1". Department of Linguistics, University of Pennsylvania. "The North Midland: Approximates the initial position|Absence of any marked features"; "On Map 1, there is no single defining feature of the North Midland given. In fact, the most characteristic sign of North Midland membership on this map is the small black dot that indicates a speaker with none of the defining features given"; "Map 1 shows Western New England as a residual area, surrounded by the marked patterns of Eastern New England, New York City, and the Inland North. [...] No clear pattern of sound change emerges from western New England in the Kurath and McDavid materials or in our present limited data."
