The Atlas of North American English

The Atlas of North American English: Phonetics, Phonology and Sound Change (abbreviated ANAE; formerly, the Phonological Atlas of North America) is a 2006 book that presents an overview of the pronunciation patterns (accents) in all the major dialect regions of the English language as spoken in urban areas of the United States and Canada. It is the result of a large-scale survey by linguists William Labov, Sharon Ash, and Charles Boberg.

Source: Wikipedia — The Atlas of North American English (CC BY-SA 4.0)