Interesting 1976 map of English dialects in Texas, demonstrating the divide between the more Deep Southern accent of East Texas (drawl) vs. the more Appalachian accent of North and West Texas (twang)

Dialects

National Map

Texas dialect - An ENGL 3360 Final Project by Garrett Haley

PDF) A DICTIONARY OF VARIETIES OF ENGLISH

The Southern Drawl: Breakdown of an American Accent - SpeakUp resources

Map of North American English Dialects, Based on Pronunciation

Map of North American English Dialects, Based on Pronunciation

List of dialects of English - Wikipedia

AZ ITU Journal of Faculty of Architecture 2016-1 by LookUs Scientific - Issuu

Why do Americans have different accents depending on what region they are from? - Quora

Texas - Wikipedia

Chapter 1: Just What and Where Are Appalachian Englishes?, West Virginia Dialect Project

Download - Linguistic Society of America