Localized accents within the state of North Carolina

[Barnhart]

Kurath and McDavid is always a good source.

The Pronunciation of English in the Atlantic States (U. of Alabama
Press, 1961)
Word Geography of the Eastern United States (U. of Michigan Press,
1949, 1966)

Carver (American Regional Dialects) and Reed (Dialects of American
English) may be helpful.

There may be help, too, in Metcalf (How We Talk, Houghton, 2000).

Regards,
David

barnhart at highlands.com