Ben Ward & Walt Wolfram 
American Voices [PDF ebook] 
How Dialects Differ from Coast to Coast

American Voices is a collection of short, readable descriptions of various American dialects, written by top researchers in the field. written by top researchers in the field and includes Southern English, New England speech, Chicano English, Appalachian English, Canadian English, and California English, among many others fascinating look at the full range of American social, ethnic, and regional dialects written for the lay person