The Atlas of North American English. Labov, W., Ash, S., & Boberg, C. Mouton de Gruyter, 2006.
bibtex   
@book{labov_atlas_2006,
	title = {The {Atlas} of {North} {American} {English}},
	publisher = {Mouton de Gruyter},
	author = {Labov, William and Ash, Sharon and Boberg, Charles},
	year = {2006},
}

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