The local newspaper from Martha's Vineyard reflect on Labov's seminal study there:
http://www.mvtimes.com/2011/08/16/50-years-language-study-began-marthas-vineyard-6918/
Labov's a sound writer, and you can read the original study here:
http://web.stanford.edu/~eckert/PDF/LabovVineyard.pdf
