One of my volunteer activities is as a reader for Reading for the Blind and Dyslexic. Yesterday the book chosen for me to read was "Appalachian Folkways" by John Rehder. The chapter I recorded was concerning the structure of barns and other outbuildings in a particular region of Appalachia. The part I thought was pertinent was a discussion by the author about how migrations within the United States could be traced based on the style of architecture used. He was discussing primarily barns and contrasted German vs. Scotch-Irish barn styles. He also discussed how much of what we consider indigenous to Appalachia is really a continuation or expansion of European practices. Since this is the area in which many of us find our ancestors I found it quite interesting (not everything I have to read for them is). I did a Google search and found this: http://www.press.jhu.edu/books/title_pages/3198.html