There was a more general 2005 documentary with interviews by Robert MacNeil of the NewsHour called Do You Speak American? http://www.pbs.org/speak/ http://www.

There was a more general 2005 documentary with interviews by Robert MacNeil of the NewsHour called Do You Speak American? http://www.pbs.org/speak/ http://www.pbs.org/speak/ Also, I have serious doubts about the "differences" in SF Bay Area upper and lower peninsula pronouncing "on." Source: 40 year resident.