Two (2) maps of American English dialectal regions -- the first by Robert Delaney (with descriptions) and another by Jeremy Smith (see link below second map)
Partners in Language Development: By facilitating language-based development, SIL International serves the peoples of the world through research, translation, and literacy.
B. Klimek, N. Arndt, S. Krause, и T. Arndt. The 10th edition of the Language Resources and Evaluation Conference, 23-28 May 2016, Slovenia, Portorož, (2016)